I think that I do not have enough substate in my tank. If you look underneith it you can see light come through. I have plants but I don't think the substrate is deep enough. My question is can I add some substrate on top of the plain gravel I have now? Will it hurt the fish or if I wash it really good will it work? I was thinking about adding flourite on top of plain gravel. Will it be ok with fish already in there? Would 40 pounds on top of my old gravel work with my 55?
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