take the rock out and hit it with a hammer and chisel. when you have the size you need rinse it in some water and put it back in the tank. unless you let it dry out pretty good there won't be any die off that will matter.
Steve
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 *everything said above is just my opinion, and may or may not reflect the views of this BBS, its Operators, and its Members. If cornered on any “opinion” I post I will totally deny having ever said this in a Court of Law…Unless I am the right one*
Some strive to be perfect.... I just strive.
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