Okay, well, my Mom baught me 3 lamp eye tetras, they can grow up to 3 inches (9g total). And I want to know if its possible for me to add bleeding heart tetras (2g each tet), orange von rio flame tetras (2g each tet), or bloodfin tetras (2g a tet) into the same tank as them and they be okay with each other? Or maybe form a school together? I'm getting a 30g and I'm trying to figure out what I want to add into it. Thanks all.