how much water?

[motohead]

i was wondering how many gallons of water that rock displaces.i have a 100 and just did a 30 gallon water change and it seemed to me that after i sucked out the 30 gals that my water level was kinda low.i usually do a 20 gal change so thiis was 10 more than usual.still,the waterlevel ropped about 6 or 7 inches from the bottom know some goes into my sump but only a couple gallons or so.just was wondering.i do have about 130 lbs of rock in there give or take a couple lbs.

[NaCl_H2O]

That is really hard to say! Each type of rock, and each individual piece is different in its porosity and the amount of water it will displace. You could see how much water a piece of your rock displaces and then multiply it out - but it would still just be a guesstimate.

[MikeDeL]

http://www.garf.org/calculators/Tank...Calculator.asp
Here is a link from garf. It can help give you a general idea.

[motohead]

now that was interesting.that calculator says about 68 gallons of water remain in my tank.odd but it sounds about right.it did look like i had changed almost half the water volume in there.thanks for the link mike.and i sure would hate to try to guess about your tank there naci

[mathias]

so does that mean you do your additives to 68 gallons or 100?

[motohead]

ummmmm,what additives?i dont add nothing but water changes,iodine and kalkwasser.

[CD]

iodine

Any particular reason you are adding this?

W.

[NaCl_H2O]

iodine

Any particular reason you are adding this?

The Iodine police are watching ... ;)

[CD]

The Iodine police are watching

LMAO...I figured since Gary wasn't online, I'd go ahead and say it...LOL :lol

W.

[motohead]

i add iodine to aid my shrimps in molting.seems to help them along.it is chelated so it is minor.