Every time I turn the tank light on, my neon tetras go insane. They go to the bottom of the tank and start swimming around like crazy. I want to have the light on all day so it makes a day and night cycle for the fish. If no one is in my dorm room during the day it is very dark and when I turn the tank light on the fish go insane. They even go to the bottom when the room light is on. If my room is pitch black and I turn a small lamp on, I see them swimming all over the tank, not just on the bottom. If I leave the light on for a little while they try and find something to hide under. Should I get a less intense bulb? I don't think it is any brighter than the lights they use at the LFS, so I don't understand why they don't like light.