Man, my TinFoil Barbs have been acting up lately. Not eating and they freak when I get near the tank. I've noticed their color has darkened a little bit and they're not eating. Man, one of them the other day, he freaked, shot up the side of the tank and knocked himself silly. He was swimming upside-down for about 2 minutes and then he uprighted himslef and was fine. I think he's don that a couple of times. Anyways, my water needs some serious attention soon. I was recommended to put Sand in there and forget the Rock-Gravel. How do I filter that sand + I have 2 Eels? By the looks of my redins for the water, I believe something is seriously wrong. Thanks for the advice. Peace.