I am at the stage in my setup where I'm trying to decide on which type of substrate for my fish. I have the black diamond blasting sand in my 75 but I will be adding a fire eel when my 210 gets up and running but I want to make sure that whatever I use will not be harsh on the fire eel since they sometimes burrow. The other fish in the tank include tiger shovel nose, fresh water lion fish, clown knife, and a couple of bichirs. I have also been considering pool sand because I have used it before in a 150 that I had.
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