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http://indianaquariumhobbyist.com/community/ :: View topic - weight of rocks in a tank
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weight of rocks in a tank
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rahulk
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PostPosted: Thu Apr 13, 2006 3:18 pm Post subject: weight of rocks in a tank Reply with quote

 Hi  Guys,
               Is  there  a  thumb  rule  for  the  amount  (weight)  of  rocks  that  can  be  put  into  a  fresh  water  tank  ?
 I  have  a  6x2x2  (feet)  tank  made  of  12  mm  float  glass  (saint  globain),  it  stands  on  a  metal  stand  which  has  6  legs  and  lot  of  cross  links  .  The  tank  is  kept  on  thermocole  below  which  is  a  14  mm  plywood  sheet.  
 
 Please  advise  how  many  rocks  i  can  put  in  (tang  setup)
 
 Regards  
 Rahul
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ajaikumarr
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PostPosted: Thu Apr 13, 2006 4:44 pm Post subject: Re: weight of rocks in a tank Reply with quote

 IMO,  there  is  no  thumb  rule...  You  have  to  take  care  about  the  weight  which  your  stand  can  support.
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rahulk
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PostPosted: Thu Apr 13, 2006 5:51 pm Post subject:  Reply with quote

 Ajai,
 
 The  stand  i  got  made  is  of  the  highest  quality  and  the  guy  who  made  it  told  me  that  i  could  easily  support  1.5  tonns(1500  kgs),  
 what  about  the  bottom  glass  ,  is  the  total  weight  of  rocks  +  sand  +++  directly  transfered  to  the  stand?
 I  am  worrid  about  the  bottom  glass.
 
 Rahul
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ajaikumarr
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PostPosted: Thu Apr 13, 2006 6:20 pm Post subject:  Reply with quote

                                                   
rahulk  wrote:                
Ajai,
 
 The  stand  i  got  made  is  of  the  highest  quality  and  the  guy  who  made  it  told  me  that  i  could  easily  support  1.5  tonns(1500  kgs),  
 what  about  the  bottom  glass  ,  is  the  total  weight  of  rocks  +  sand  +++  directly  transfered  to  the  stand?
 I  am  worrid  about  the  bottom  glass.
 
 Rahul                

 
 If  your  are  not  going  to  dump  the  rocks  in  a  single  place  there  would  not  be  any  problems...  Scatter  the  rocks  in  way  that  the  wieght  are  evenly  splitted,  also  make  sure  that  the  pointing  rocks  does  not  touch  the  glass  anywhere  bottom  and  sides  Smile
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Danny
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PostPosted: Thu Apr 13, 2006 7:07 pm Post subject:  Reply with quote

 You  can  even  place  the  rocks  on  small  pieces  of  styrofoam  or  thermocol  inside  the  aquarium  and  cover  up  the  thermocole  (hide  it)  by  the  gravel  or  sand  (which  ever  is  being  used).  The  main  purpose  is  to  prevent  scratches  being  formed  on  the  base  glass  (bottom)  of  the  aquarium.  It  can  also  help  to  a  little  extent  in  spreading  out  the  weight  of  the  rock  on  the  base  glass.
 Hope  this  helps  Smile
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Madan
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PostPosted: Thu Apr 13, 2006 7:16 pm Post subject:  Reply with quote

 What's  the  size  of  the  angle  bars  you  have  used  for  the  stand?
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rahulk
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PostPosted: Thu Apr 13, 2006 7:17 pm Post subject:  Reply with quote

 I  Have  seen  people  doing  up  rock  work  which  is  all  the  way  to  the  top  of  the  tank  ,  possibly  the  rocks  are  glued  together  so  that  they  dont  slip.  This  type  of  arangement  of  rocks  is  going  to  weigh  500-600  kgs  ,  
 
 Do  these  type  of  arrangements  need  thicker  glass  or  some  thing  special  ?
 will  it  be  possible  to  do  this  in  my  tank  assuming  that  the  tank  stand  will  hold  ?
 
 Thanks  for  your  help  guys.
 rahul
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ajaikumarr
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PostPosted: Thu Apr 13, 2006 7:29 pm Post subject:  Reply with quote

                                                   
rahulk  wrote:                
I  Have  seen  people  doing  up  rock  work  which  is  all  the  way  to  the  top  of  the  tank                

 
 Prob  you  can  try  DIY  Styrofoam  rocks  too...
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toomanyfish
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PostPosted: Thu Apr 13, 2006 10:30 pm Post subject:  Reply with quote

 i  have  a  6  by  2  by  2  and  a  half  feet  oscar  tank  which  has  about  300  kilos  of  sand  and  400  kilos  of  stone..  (though  have  taken  out  some  now  not  due  to  the  weight  factor  but  the  fish  needed  more  room!)  and  i  have  face  no  problems  so  far.have  a  thick  thermocol  sheet  which  is  placed  on  19mm  marine  ply
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cokeamod
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PostPosted: Thu Apr 13, 2006 10:48 pm Post subject:  Reply with quote

 If  there  is  a  thick  ply  sheet  between  the  bottom  glass  and  stand  which  is  even  (weight  bearing)  in  all  places,  no  problem  to  the  bottom  glass...  
 
 Only  if,  as  said  by  ajai,  there  is  no  pointed  rock  placed  directly  or  in  contact  with  the  glass.  
 
 Although  I  highly  doubt  whether  lava/tufa,  the  real  live  rocks  can  sctrach  a  glass  of  good  quality,  cause  glass  (paste  as  it  is  called)  has  a  hardness  of  around  5-5.5  and  most  calcerous  rocks/minerals  have  a  hardness  around  3  to  4.5.
 
 Regards,
 amod.
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rahulk
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PostPosted: Thu Apr 13, 2006 11:34 pm Post subject:  Reply with quote

 Thanks  for  your  replies,  
 i  will  put  in  some  rocks  this  week  with  some  cusioning  at  the  bottom  of  the  rocks.
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retro_gk
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PostPosted: Fri Apr 14, 2006 4:00 am Post subject:  Reply with quote

 It  is  better  to  use  egg-crate  (light  diffusers)  under  the  rocks  than  styrofoam  to  distribute  the  weight  better.
 
 DO  NOT  place  egg-crate  under  the  tank!!!
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aquascapes
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PostPosted: Fri Apr 14, 2006 4:49 pm Post subject:  Reply with quote

                                                   
Quote:                
What's  the  size  of  the  angle  bars  you  have  used  for  the  stand?                

 Hey  Rahulk,
 You  missed  out  madan's  question  which  is  really  important  to  consider!  (if  the  angle  bars  are  sturdy  the  ply  does  not  matter  -  provided  it  is  well  supported  from  the  bottom)
 I'd  suggest  you  to  put  in  the  substrate  first  -  a  1½"  to  2"  layer  and  just  put  a  sheet  of  'netlon'  over  it  and  then  place  your  rocks  on  the  netlon  and  put  in  the  rest  of  the  substrate  -  this  way  you  don't  directly  put  pressure  on  a  particular  point  on  the  bottom-plate.
 I  would  also  suggest  to  refrain  from  putting  heavy  rocks  on  the  apex  level  of  your  rock-work  -  provide  a  good  strong  base  using  some  large  and  heavy  rocks  and  as  you  move  further  up  the  size  and  the  weight  of  your  rocks  should  keep  on  decreasing!
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rahulk
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PostPosted: Sat Apr 15, 2006 6:26 pm Post subject:  Reply with quote

 Hi  Madan,
             Each  side  of  the  angle  is  1  1/2  inch  long  and  the  thickness  is  around  3-4  mm  thick  (dont  have  a  vernier  calliper  to  measure  ).  Would  this  be  sufficient?
 Thanks
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venkateshsriraman
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PostPosted: Wed Apr 19, 2006 5:51 pm Post subject:  Reply with quote

 Rahul,
 
 instead  of  going  for  real  rocks,  go  for  styrofoam.  would  pm  u  some  nice  diy  projects  with  which  you  can  save  lot  of  weight  troubling  the  tank...
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