Hey guys, I'm new here and to the whole aquarium thing. My current setup is this. I have a 20 gallon tank with three zebra danios in it. Have a couple of water lettuce, two real plants, three planted ones that haven't sprouted yet, and a couple of plastic plants. The zanios are of different sizes and so the smallest one has gotten really thin. Right now he won't even eat. I asked my fiancée to isolate him to a 1 gallon hospital tank. He still swims well, with the others he hid a lot, and would only take tiny bites off the flakes. This morning though he was completely uninterested. I think it is stress, since the other two pick on him, but he looks thin and pale and I want him to recover. Someone please help !