nano cube questions

it doesnt have to be a 1 piece, you could get a few smaller pieces of rubble and glue them together to make sure the piece will fit.

 

not much water depth to work with in chamber 2 of the biocube, i found the perfect pourous piece of fiji LR, had some bristle star fish -- removed all the lava rock and did a 10g water change, scrubbed all the green stuff off my glass that Ive let grow for a few weeks for my snails and pods to munch on. waiting for daylights to turn on so I can see how everything is doing the xanthid crab in the back of my tank is a lot happier he has a big rock to live on instead of crawling through pieces of lava rock :x