Serpentman
Aquarium Advice Activist
I am planning my sump system and had a question. My plan is to fill 1/2 of the sump with dead rock to add additional biofiltration capacity. My thought was to use crushed landscape lava found at HD. Personally, I can't see how this is much different than the stuff sold at the LFS, however, I figured I would check here first. Is this ok to use?