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http://indianaquariumhobbyist.com/community/ :: View topic - Marine Grade Plywood Aquarium - except the front glass
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Marine Grade Plywood Aquarium - except the front glass
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Madan
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PostPosted: Mon May 17, 2004 1:07 pm Post subject:  Reply with quote

                                                   
Quote:                
Hello,madanji...hope  i'm  not  pestering  you  with  my  questions  (if  so,my  most  sincere  apologies!)  ...because  I  have  some  more....according  to  a  rough  estimate  your  tank  will  weigh  1,700  kg....  nearly  the  weight  of  a  small  car...will  it  be  ok  to  put  such  a  load  on  the  balcony?(or  a  similar  weight  on  the  first  floor  flat?)                  

 
 No  problems  with  that,  mine  is  not  an  cantilever  type  balcony.  You  forgot  the  weight  of  the  sand  and  rocks.  1  ton  more  maybe.  :lol:  
 
 
                                                 
Quote:                
Secondly,I  have  posted  pictures  of  yesterday  night's  drama,pulling  out  UG  filter  and  tons  of  mulm  accumulated  under  the  gravel(I  have  sincerely  been  siphoning  at  regular  1  week  intervals...yet  after  nearly  one  year  of  service  the  ug  finally  failed)Luckily  the  tank  was  only  a  60  gallon  tank.I  will  not  imagine  that  happening  with  a  370  gallon  tank.    ...are  you  sure  you  want  to  go  in  for  a  UG  prefilter?                

 
 UG  prefilter  is  no  problems.  I  am  thinking  of  avoiding  it  for  other  reasons  though.  Making  one,  lack  of  time  and  all  that.
 
 How  come  you  have  so  much  mulm  under  the  UG  plate?  I  have  had  a  tank  running  on  UG  mode  for  1  1/2  years  and  when  I  finally  dismantled  that  tank  the  underside  of  the  UG  plate  was  teeming  with  a  coat  of  slimy  bacteria.  When  the  plate  finally  dried  out  I  got  transparent  flakes  of  dried  bacteria  which  I  used  as  a  starter  culture  for  a  new  tank.  Not  sure  if  the  flakes  did  any  good.
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PostPosted: Tue May 18, 2004 7:47 am Post subject:  Reply with quote

 While  we  are  on  UG  filters...  Murthy  what  was  the  size  of  the  UG  plate  (  L  x  B  ),  and  what  was  the  flowrate  through  the  UG  filter  ie.,  powerhead  capacity.
 
 There  is  a  certain  minimum  waterflow/unit  filter  area,  required  through  an  UG  for  it  to  be  effective  something  like  6  times  the  tank  volume  through  the  entire  UGF  for  tanks  upto  20  inches  high  is  what  I  had  calculated  a  long  time  ago.  Maybe  that  will  explain  the  poor  functioning  of  the  UGF.
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PostPosted: Tue May 18, 2004 10:49 am Post subject: UG filter dimensions Reply with quote

 Hello,madanji!
 Here  are  the  dimensions  of  filter  plates:
 L,58  inchesxB,15  inches....for  a  tank  of  dimensions:60in  x  18in  x  18in.
 Gravel:about  2-2.5  in  layer....grain  size  3-4  mm,marble  chips(maybe  the  grain  size  is  too  large?.....I  chose  it  for  easier  flow  of  water,and  to  prevent  too  tight  packing  with  the  smaller  grain  size...)The  UG  is  powered  by  two  powerheads...each  of  600  ltrs  per  hour(total  1200  ltrs/hr)tank  capacity  is  about  370  ltrs(so  there  also  maybe  circulation  is  falling  short?)
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PostPosted: Tue May 18, 2004 1:15 pm Post subject:  Reply with quote

 I  have  a  feeling  it  may  be  circulation.  I  have  to  look  up  that  article  I  printed  out  a  long  time  ago  detailing  minimum  circulation  through  a  UGF.
 
 For  a  70  x  12    UGF  on  a  72  x  14  x  21  inch  tank  I  had  a  3000L/Hr.  power  head  and  absolutely  no  problems  at  all.
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PostPosted: Tue May 18, 2004 7:38 pm Post subject: will do.... Reply with quote

 I  am  going  to  try  out  the  Ug  system  again,this  time  with  two  bodyguard  powerheads,2000  each(total  4000  ltr/hr....overkill?its  ok,i  guess)this  tank  will  be  the  same  dimensions  I  mentioned,60x18x18  inches...and  will  house  a  school  of  mature  venustus...3  males  and  about  6  females...venustus  dont  require  any  rocks  no?they  are  open  water  swimmers,so  I  will  be  placing  few  rocks  strategically  for  fish  to  hide  in  distress.  Very Happy  hope  I  get  it  right  this  time...hope  they  spawn!
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PostPosted: Tue May 18, 2004 8:46 pm Post subject:  Reply with quote

 Murthy  when  it  comes  to  filtration  there  is  nothing  like  overkill.  More  is  never  enough.  With  2  x  2000  L  powerheads  make  sure  they  are  not  churned  around  by  the  jetstream,  direct  the  jet  against  something.
 
 Cichlids  like  to  dig  and  build  a  nest,  venestus  are  cichlids  right?  Won't  a  UGF  undermine  their  spawning?
 
 At  last  managed  to  dig  up  that  article  on  flowrates  through  UGF.  A  good  flow  rate  would  be  1.0  -  1.5  gallons/  sq.foot  /  minute  for  the  UGF  to  be  effective.
 1  gallon  =  4.8  liters  of  water  (  the  article  was  not  written  by  an  American  but  a  Britisher).
 
 In  your  case  it  is  6  x  1.5  =  9  sq.ft
 that  is  9  x  1.5  =  13.5  gallons  /  minute  (  I  always  take  the  upper  limit  )
 that  is  13.5  x  60  =  810  gallons/hr
 that  is  810  x  4.8  =  3888  liters/hr.
 
 4000  l/hr  flow  rate  falls  quite  close  to  1.5  gallons/sq.ft/minute  given  the  uncertainity  of  flowrates  through  power  heads  and  should  be  very  good.
 
 I  am  sorry  I  don't  have  the  url  of  that  article  and  I  cannot  reproduce  it  in  full  here.
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PostPosted: Wed May 19, 2004 11:52 am Post subject: THANKYOU!!! Reply with quote

 Thanks  once  again,the  info  you  give  is  clear  enough...can  manage  without  the  URL  Very Happy  ...
 Almost  all  the  fish  I  keep  are  cichlids...so  then  UG  is  again  not  to  be  used?  Crying or Very sad  ....I  have  breeding  metriaclima,want  to  breed  the  venustus,labidochromis,blue  and  yellow  auratus,...and  finally  frontosas(which  also  love  to  move  gravel  around...)so  where  to  use  the  UG  filters?...I  have  a  good  idea!!!I  will  go  and  buy  some  nice  angels,rams...(or  some  cichlids  that  will  not  dig  up  substrate)  :lol:  ...this  is  what  I  end  up  doing,buy  filters  for  fish,and  finally  fish  for  filters!
 We  have  finally  decided  to  go  in  for  a  8  x  3(height)x2  ft  ply  tank.This  is  not  for  me  personally,but  for  a  friend  of  mine  here(i  want  to  be  the  last  to  make  this  tank  Very Happy  )...hopefully  will  post  on  the  forum  regarding  its  progress!
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PostPosted: Wed May 19, 2004 4:59 pm Post subject:  Reply with quote

 Just  remember  that  the  flowrates  that  manufacturers  claim  are  when  they're  run  without  any  obstruction.  So  when  you  fit  it  on  an  ug  filter,  flowrates  are  that  much  lesser.
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PostPosted: Wed May 19, 2004 6:03 pm Post subject:  Reply with quote

 Not  by  much  Beta.  In  fact  it  will  be  closest  to  what  the  manufacturers  claim  when  run  on  a  UGF,  if  they  claim  accurately.  Add  a  piece  of  tubing  on  the  outlet  and  then  it  will  drop  a  lot  more.
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PostPosted: Wed Jun 16, 2004 7:21 pm Post subject:  Reply with quote

 Finally  the  lights  are  up  and  here  is  a  photo.
 
 Sorry  can't  upload  a  photo  to  Gallery.
 
 I  get  the  following  Critical  error:
 
 Quote
 PHP  running  on  your  server  does  not  support  the  GD  image  library,  check  with  your  webhost  if  ImageMagick  is  installed  .
 unquote.
 
 Sorry  guys.
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PostPosted: Sun Jul 25, 2004 9:11 pm Post subject: ply tank Reply with quote

 hello  madanji!
 
       I  have  revised  the  entire  thread  on  your  ply  tank.I'm  not  sure  if  a  part  of  the  thread  has  been  lost  due  to  crash.The  details  of  the  carpenter's  role  is  clear.I  assume  that  the  3  inch  patti  frame  that  runs  around  the  tank,is  nailed  to  the  rest  of  the  wood.And  the  glass  sheet  is  place  inside,and  siliconed  to  this  3  inch  frame.I  remember  you  mentioning  fibre  glass  resin  instead  of  epoxy  coat.
 1.Any  specific  advantage  in  fibre  glass?
 2.Can  color  be  mixed(black/dark  color)?
 3.what  and  where  to  ask  for  fibre  glass?
 
         Very Happy  the  carpenter  is  waiting  with  all  his  tools,and  a  puzzled  look  on  his  face."macchli  ghar?lakdi  se???"
           please  help.thanks  for  all  the  help!
 Please  see  my  proposed  tank  design  in  the  gallery.
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PostPosted: Mon Jul 26, 2004 8:07 am Post subject:  Reply with quote

 Hi  Murthy,
 
 You  make  a  five  sided  box.  The  open  side  of  the  box  obviously  is  the  Top  Very Happy  .
 
 
 For  the  front  side  of  the  box  remove  all  material  except  a  3  inch  width  piece  all  around.  The  glass  gets  pasted  on  to  the  inside  of  this  piece  after  the  application  and  complete  curing  of  epoxy  or  fiber  glass.
 
 Do  not  use  nails  use  wood  screws.
 
 In  addition  there  is  a  3  inch  wide  frame  that  is  screwed  on  along  the  top  edges  of  the  vertical  side,  this  frame  has  2  cross  members  also  3  inch  wide.  The  back  plywood  piece  will  need  to  be  supported  with  2  x  3  inch  vertical  supports  again  screwed  on  to  the  back  pane.
 
 Make  sure  all  the  vertical  sides  rest  on  the  horizontal  base  for  maximum  strength.  
 
 
 Fiber  glass  resin  comes  in  3  parts  -  resin,  catalyst  and  hardener.  Mix  all  three  in  small  quantities  and  apply.  You  also  need  to  get  fiber  glass  cloth  and  apply  2  layers  all  along  the  inside  for  water  proofing.
 
 Murthy  if  you  are  considering  applying  fiber  glass  in  the  confines  of  your  apartment  forget  it.  It  may  turn  out  to  be  uninhabitable  for  a  few  weeks.
 
 Do  not  make  any  holes  in  the  wood  for  piping  etc.,  I  had  a  hard  time  sealing  these  holes.  Best  avoided.
 
 12  mm  thick  float  glass  is  sufficient,  but  in  case  you  want  to  be  extra  careful  use  15mm  glass.
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PostPosted: Mon Jul 26, 2004 6:34 pm Post subject:  Reply with quote

 Very Happy  I  am  going  in  for  12  mm  glass.The  house  will  remain  uninhabited  for  atleast  another  40  days(ashaada  maasa,after  which  there  will  be  a  gruha  pravesha!)So  fibre  glass  is  what  I'll  opt  for.Wish  me  luck!  Very Happy
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PostPosted: Wed Aug 04, 2004 11:00 am Post subject:  Reply with quote

 hello  Madanji...  
 Confused:  ...what  about  bitumen??can  that  be  used  to  coat  the  ply  wood?in  place  of  resin?(just  making  sure  ive  been  through  all  options  for  the  plytank!)
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PostPosted: Wed Aug 04, 2004 12:07 pm Post subject:  Reply with quote

 I  really  don't  know  if  it  will  stick  to  wood.  So  can't  answer  that.
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