They are not messy eaters, just messy poopers. The get big and their turds are stringy globs when they are fresh but then turn to diarea stuff like oscars. I keep tons of snails in my knife tank; they keep the glass clear. To clean my driftwood, rocks, and bottom, I use a mini-vacuum brush that I put on a pipe. On the other end of the pipe is a hose and I vacuum while I am brushing the gunk that stuck to everything.