I purchased a 20 gallon long tank and began to cycle it. The tank has now completed its nitrogen cycle. I decided to add 3 red phantom tetras to the tank to start out (I plan to add more of these fish in the coming weeks as I know they enjoy being in schools). However, the problem I'm having is that I've noticed they are very skittish - if you come near the tank or make any inadvertent sudden movements, they quickly swim away to the very back of the tank behind various plants and rocks and stay there until you've move away or they can't see you any longer. The problem is that I can't tell if they're eating or even know that they're being fed because the swim away the second I get close in order to feed them. It seems that the food just floats at the surface of the water for awhile and eventually just sinks to the bottom without them noticing. They've stayed alive for several weeks now without any problems so I'm assuming they just find food scraps laying around the bottom of the tank, but I'm not entirely sure. Maybe this behavior will be different when they're in a larger school and feel more secure? Any help or insight would be greatly appreciated. Thanks!