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http://indianaquariumhobbyist.com/community/ :: View topic - Water Flow- Importance in an FOWLR
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Water Flow- Importance in an FOWLR

 
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Gulls
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PostPosted: Mon Mar 08, 2010 2:25 pm Post subject: Water Flow- Importance in an FOWLR Reply with quote

 HOW  MUCH  is  the  water  flow(current)  IMPORTANT  in  an  FOWLR?
 
 I  know  its  very  very  important  for  a  reef  tank.
 
 IMO  too   much  flow  might  stress  the  fish  .
 And  I  wish  to  know  its  effect  on  live  rocks  (apart  form  the  algae  bloom).
 Would  the  invertibrates  be  effected  in  any  way?
 
 Need  advice  so  that  I  can  keep  or  remove  the  extra  powerhead  I  recently  added  to  increase  the  flow  in   my  70  Gallon  FOWLR.
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gremlin
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PostPosted: Mon Mar 08, 2010 6:34 pm Post subject: Re: Water Flow- Importance in an FOWLR Reply with quote

                                                   
Quote:                
IMO  too   much  flow  might  stress  the  fish  .                

 
 Linear  water  flow  is  not  good.  It  also  depends  on  the  fish  you  have.  Tangs  like  archilles  and  powder  blue  love  turbulant  water  flow.  How  much  flow  you  have  in  your  70?
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cokeamod
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PostPosted: Mon Mar 08, 2010 7:36 pm Post subject: Re: Water Flow- Importance in an FOWLR Reply with quote

 You  can't  have  too  much  flow  in  a  70g  tank  with  power  heads.  Hence,  go  ahead  and  do  all  you  can  to  increase  the  flow.
 
 Live  rocks  will  benefit  from  the  extra  flow:-  less  bad  algae,  more  coralline,  micro  inverts(  like  tiny  fanworms)  will  benefit.
 
 Other  larger  inverts  like  hermits,  polyps  will  also  benefit  from  the  increased  flow.
 
 Best  thing  you  can  do  is  place  power  heads  in  such  a  way  that  there  is  medium-to-ample  flow,  and  without  a  dead  spot  in  the  tank.
 Be  careful  though,  too  many  power  heads  will  significantly  increase  chances  of  sucking  fishes  in  the  rotor,  as  well  as  increase  water  temperature.
 
 Regards,
 Amod
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gremlin
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PostPosted: Mon Mar 08, 2010 8:29 pm Post subject: Re: Water Flow- Importance in an FOWLR Reply with quote

 Just  to  give  you  an  idea,  in  my  90g  frag  tank  I  have  about  8000  gph  flow  without  including  the  flow  from  my  return  pump,
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Gulls
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PostPosted: Wed Mar 10, 2010 12:07 pm Post subject: Re: Water Flow- Importance in an FOWLR Reply with quote

 HI  All
 
 My  tank  dimensions  are   42"  L  X  21"  B  x  24"  H.
 It  hosts  just  a  bit  above  300  liters  of  water.(  hope  my  conversions  as  per   the  gallon  parameter  are  near  approx.)
 
 Currently  I  have  three  powerheads  of  1200lph  (one  on  the  left  top  at,  1  (  1500lph)  at  middle  level  on  the  right  directed  diagonally  and  another  at  lower  bottom  level  placed  on  the  right  side  glass  pane  ).
 Can  see  the  movement  of  water  at  all  corners  and  levels  now.   
 Not  including  the  flow  created  by  the  canister  outlet  and  the  2500lph  pump  used  for  the  hang-on  skimmer.
 
 Initially,  the  fishes  ,  particularly  the  sailfin  tang  looked  bothered.  But  now  I  find  it  enjoying  the  currents.
 
 My  green  carpet  anemone   suddenly  moved  closer  to  the  flow  (near  the  additional  powerhead.)  This  is  the  first  time  i  noticed  it  move  (change  its  rooted  position)  in  last  6  months.
 
 Hope  it  is  a  good  sign...
 Advises  are  always  welcome....
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ramsarma1972
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PostPosted: Thu Mar 11, 2010 4:05 pm Post subject: Re: Water Flow- Importance in an FOWLR Reply with quote

 I  would  like  to  have  a  clarification:
 
 My  tank  size  is  4  x  2  x  2  (  roughly  120)  gallons.  I  also  have  a  sump  which  is  large  but  has  finger  corals,  coral  sand  etc.  and  so  volume  addition  would  only  be  about  50  lts.  So  i  may  say  its  safe  to  assume  475  lts  as  the  volume  of  water.
 
 The  display  tank  has  a  wavemaker  of  capacity  5000  lph.  I  also  use  a  2500  lph  pump  that  returns  the  water  from  the  sump  to  the  display  tank.
 
 So  what  is  my  effective  water  flow?  Is  it  sufficient?
 
 
 @  gulls  -  sorry  if  i  am  butting  into  your  post,  the  idea  is  to  get  the  fundas  right  and  not  to  hijack  your  post.
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gremlin
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PostPosted: Thu Mar 11, 2010 7:01 pm Post subject: Re: Water Flow- Importance in an FOWLR Reply with quote

 http://www.reefcentral.com/calc/hlc2.php  
 
 This  calculator  will  give  you  head  loss  for  your  return  pump.  SO  your  660g/hr  return  pump  is  not  pumping  water  at  that  rate  at  4  or  5  foot  hight.  Also  your  powerhead  is  only  1320g/hr  which  is  not  enough  for  your  120g.  General  rule  is.  they  circulation  from  the  Power  heads  should  be   atleast  60-70  times  the  water  volume.  SO  you'll  need  atleast  5  or  6  more  PH  to  get  optimum  flow  in  your  tank.  INstead  of  getting  one  big  power  head  get  atleast  4  and  attach  it  on  each  side  of  the  tank  so  the  water  movemen  is  chaotic  and  not  laminar.
 
 Its  not  only  for  the  health  of  your  fish  and  corals  ,  the  flow  helps  the  detrus  from  settling  on  the  sand  and  rock.
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nash81
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PostPosted: Thu Mar 11, 2010 7:33 pm Post subject: Re: Water Flow- Importance in an FOWLR Reply with quote

 Hi  Gulls,
 
 Rather  than  having  one  large  wave  maker,  its  more  advantageous  to  have  multiple  even  though  the  flow  of  each  will  be  lesser  but  you  will  have  fewer  dead  spots.  In  a  tank  your  size  i  would  make  some  spray  bars  and  place  it  along  the  bottom  of  the  tank  hard  piped  and  make  jets  in  them.  I  have  done  that  with  a  couple  of  tanks  i  have  setup  and  the  fish  and  live  rocks  seems  to  live  it.  Its  almost  20X  the  flow  and  i  have  coraline  spreading  like  crazy,  a  lot  of  tube  worms  and  fan  worms,  polyps  and  zoanthid  colonies  are  multiplying  and  so  are  the  mushrooms.
 
 So  i  would  not  shy  away  from  the  added  flow.  Even  abroad  a  lot  of  serious  hobbyist  are  now  cosidering  20  to  30X  flow  in  their  main  systems  without  the  actual  return  from  the  sump  /  refugium.  The  bottom  spray  bar  idea  i  took  for  a  friend  in  California.
 
 Warm  Regards
 Nirav  Shah
 Indiapetstore.com
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Gulls
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PostPosted: Fri Mar 12, 2010 10:14 am Post subject: Re: Water Flow- Importance in an FOWLR Reply with quote

 Thanks  Nirav..
 I  think  you  gave  a  similar  suggestion  when  I  set  up  my  tank.
 So  I  have  3  powerheads  (2  x  1200lph,  &  1  x  1500lph)  at  different  positions  and  sides  in  the  diaplay  tank.
 and  did  not  go  for  1  with  larger  capacity.
 
 Seems  to  be  helping.  And  know  what?  I  was  thinking  of  the  spray  bar  too  as  I  felt  the  flow  was  a  bit  strong  at  one  end.  Will  implement  this  too..  
 
 Dear  Gremlin  and  Nirav..
 You  too  have  been  of  great  help...
 Thanks  all  for  your  advises..  Just  keep  it  pouring...
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