I'm wanting to stock my 30gallon aquarium. I'm thinking to schools would be okay. I'm thinking of a school of 5kuhli loach. I have read if you don't keep at least 5 they will always be hiding. Then my second school I want Bala shark of 5. I have read if you don't keep them in a school that they will become aggressive. Then I want Cory Catifish. I'm thinking two of them will be fine. Then one Rubber Lip Pleco for cleaning.