ive got three of them i got from brian zimmerman on nanfa.org, i had four of them and my 7" grass pickerel jumped out at night and i found him the next morning.
i still havent covered the tank but i need to very badly, i was feeding them one day and a feeder was at the top of the water and the pickerel got hte feeder and jumped all the way out of the tank, luckily i was there and put it back into the tank, but i definatly need to build a hood.
they like TONS of plants and hiding spots too.
ive found that sunfish make great tankmates for them, the sunfish are not nearly as aggressive though when it comes to feeding, luckily my sunfish are happy with pellots.
i tried a small mouth bass with them, the bass would eat 6-7 feeder goldfish and leave NONE for the pickerel, so i had to get rid of the bass, he was only 5-6" long at the time
good luck with them, I hope to get some redfin pickerel from the waccamaw river next time im at my grandpa's house in north carolina, redfin's are the same as grass, but with red fins
matthew