I would think about returning them. Chinese algae eaters get to be 6" long and can be one of the most aggressive fish you could get. They also do a poor job of eating algae and would much rather eat whatever else you feed your fish. Also, most pleco species get huge and produce a ton of waste. Unless you had one of the dwarf species like a clown or bristlenose, you're looking at a fish that could grow to well over a foot long.