I went in to look for a nerite snail to see of my betta will tolerate one. Usually I deal with the woman but she was busy. Chit chatted a bit about what I wanted with the man that is sometimes there. The man looked blankly at me after I said I wanted a nerite since they won't take over a FW tank.. He says "Well I don't think we have those because we just had a huge boom of baby snails". He told me it would be okay to put a Chinese algae eater in with a betta and just return it when it got too big?! Can't they be aggressive sometimes? And to put it with an already aggressive fish? In a 3g tank? Oh, I almost forgot. He told me his bala shark were full grown at 4 inches. And that they don't care if they have a school or not. I asked if I could put the long-fin variety of Danios with a Dwarf Gourami and he went on to tell me DG's can't be put with anything. I've read all over the forum that they can be put with other fish that are peaceful and aren't typically top-dwellers. I feel like I was given a lot of incorrect information and wonder if I should find a new pet store! Opinions?