I like having a cover for 3 reasons.
1- the water evaporates much quicker without a cover
2- My p's do slam against the cover when chasing prey and I dont want one landing on the ground.
3- My cat likes to sit on top of the tank and attack my fish. and they like to attack her thru the glass. I would not want to see what would happen if the glass was not there.
You can use a cover or not, I could not care less, these are the reasons I use one.
heard of them jumping out!!! i had 3 reds in a 40gal temperarely and wile i was out... i guess my cat scared it and i came home and it was dry on the flor. im glad it didnt bite my cat or my st bernard.
Definately use a cover! I would make my own out of .25 inch Plexiglass. Then you can hinge the access door(s) on it too. I use a type of turn latch on mine that keeps them from popping it open. My P's don't bounce off the lid much but I made this when I had a 18" Pacu that like to see what was going on outside the tank.
yeah im with them you need some kind of cover anything donst have to be fancy but you need something plus if you drop a feeder in it may just crawl out the top of teh tank ... anyways go get that covered