I have 6 juvenile Hemichromis lifilili in a 29 gallon low-tech tank that is planted with anubias nana, some crypts and corkscrew val. I'm waiting for two to pair up, and then I'll probably take the remaining four to my LFS. These fish are messy! And I think they've eaten the snails I put in there to take care of any extra food. I need something that these fish won't pick on that'll help keep the tank free of food debris and light algae and won't nibble on my plants (much). What should I look for?