any and all. I won't run a tank without some kind of top. most are glass, some are screen.
i know right.. it made me find anything to put something tht can close every hole on top of the tank/cover.. even clothes and other stuffs lol there were a few times where my snakehead would jump out and crawl all the way below furnitures .. hahaEvery single Snakehead I have ever had has jump out of the tank at least once... I would put bricks on top of the glass lids to hold them down and they would still jump out!!!!
The question should be what fish do not jump?