I have a 10g tank, which is too small for schooling fish. The only inhabitants are a pleco and a snail. I've had my Pleco for less than a year and he has already gone from an inch and a half to six inches long. So I know that very soon it will need a much larger tank as they grow to be quite large. My snail was fine, until it began to breed profusely this week. I try to keep up with removal of the eggs, but have found a few baby snails and was debating about getting two to three small yoyo loaches and just leaving the snail to it's own devices. My problem being that I don't know if my aquarium's bio load can handle it, since Plecos are hard on the bioload as it is. I have a fluval nano filter and I check the water chemistry weekly. I have been wanting to get an under gravel filter but since I'm planning on eventually buying a larger aquarium I've been holding off on the extra expense. Could the bioload handle the extra fish if I do more frequent water changes? Feeding them will not be an issue.