Yeah, I'd be careful about the handfeeding, too. Eyesight is not good and, once he grows up a bit, he's going to have a hard bite that is easily infected. It also winds up associating your hand with food, which can make working in the tank difficult.
As for cleanup... I'd love to hear any suggestions on a viable crew as I'm planning a 90g FOWLR with a snowflake and p. antennata which will make compatibility difficult.
P.S., Not to lecture, but I'm also not sure I'd put anymore fish in there (you're working with a 55g, right?), especially a messy eater like a lion. (Which kind were you thinking of? Maybe you could get away with a dwarf... I don't know). As those fish grow, you're going to wind up with an overstocked tank. Unless you've got a sump or fuge with some heavy duty filtration, you'll likely wind up with problems. If you have plans to upgrade in the future (say, 1 year) then it's probably fine, but otherwise I'd worry about overstocking and the health of your fish.