Some Cichlids do not like too much light or light at all. Oscars hate light & act odd. My Oscar hates it. She'll lay on her side & swim around like that until I turn it off. My red devil attacks lights. thats why where the glass protecting the light bulbs ended up smashed & the light bulb.

Mind u my fish r HUGE. My fish hate the thingy at the ends of the intake. They will take them off & play with them & stick stuff up the intake, like rocks they don't want & poo & what ever else they don't want in the tank. Oscar is the one who does that the most. She'll kill a goldfish & bring its dead body to the outtake & try to stick it up there hehehe then it gets plugged like lastnight & the flow stops & the water gets stinky. stupid fishy (not really, she is too smart).

A month ago the heater broke & it was boiling the water. She was trying to pick up the heater & toss it out of her tank. I've seen her bite the heater before if it was to high so I would lower it for her (shes picky). But it was soo cool that she understands what heats her water.