I have a male betta in a 10 gallon. On Sunday I changed the 15 watt incandescent bulbs for 600 lumens CFLs. Since then all he does is swim back and forth in front of the tank. Before this when I opened the lid on the hood to feed him he'd come rushing up and wait to eat but now I have to tap on the hood to get his attention and he only eats about half the food before rushing back to patrolling the front.
I assume he sees his reflection created by the new bulbs and he's just thinking there's another fish trying to invade his territory but this has been going on for almost three days and I'm getting worried. He's slowed down quite a bit since Sunday but he's still just going back and forth...
Ten gallon tank with Tetra 10i, Aqueon 50 watt submersible heater and temp @ 78 (confirmed w/analog therm). I'm feeding him Omega One betta pellets and the occasional freeze dried blood worm. I use API tap water conditioner for PWCs and the tank has been cycling for 11 days.