Comment by Robert Jango on November 3, 2012 at 8:30am

Yeah, its safe. In fact it adds a lot of surface area with its holes and crevices.

Comment by TONY K on November 3, 2012 at 12:04pm

i don't know about fish, but as far as plants such as anubias and java fern ect, plants that like to grow on things if tying them to rocks instead of drift wood, lava rock seems to be the best for me! i thing there high in minerals and iron or something , plants just seem to grow better.

Comment by Raymond Boulanger on November 3, 2012 at 3:13pm

i have two fairly good size peaces in my 55 and my striped rapheals and hillstream loachs do not mid it one bit if ur worried because its rough surface i say just cover it in moss

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