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I received my limestone today. I'm very happy with it. There's more than enough. Only one piece has to be broken up. I plan to place it at the bottom and leave the top part of the tank for swimming (the Opae Ula, not me). I don't want to stack because I'm afraid that one would fall and hurt the shrimp. Is there such a thing as too much limestone in a tank if there is enough swimming room?
Ann

Not at all Ann, you can use as much or as little as you like. Looking back at my cubes and knowing what i know now i would of started off with a nice pile and scape of rock rather then one lump in the middle. It looks nice in the tank but it lessens the amount of hiding places that these shrimp love and thrive with.

Thank you, Odin,
I'm going to try use as much as possible without compromising space for the shrimp.
Ann