03-19-2011, 11:19 AM
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Originally Posted by Christople
I might get some slate today so we will see how that goes
I probably should have asked previously what the intention was behind this, as there is something i forgot to mention, and that is dead spots. Any slab of rock laid on the substrate will cause a dead spot beneath it, where anaerobic bacteria will occur. OK in itself if limited, but too many such spots can cause nitrogen gas to build up and harm if not kill fish and plants. When I used the slate, it was small bits, maybe 4-5 inches by 2 inches max, and only a couple. Just to keep clear areas in front for feeding corys, as the pygmy chain swords sent out runners so fast I was trying to keep them aways from a couple areas.