I have had a 29 G tank running for several years now. All that remained were 4 Zebra Danios, 1 cory cat, and an albino Pleco. I was looking to build back up my stock. I went to a local store that is known to be quite reputable and (off of a friend's suggestion) spoke to the "fish guy" there. Told him what was in my tank and asked what he suggested. He recommended (in phases) building back up my school of danios, a school of tetras, and pair of dwarf gouramis. OK, so first I bought 2 dwarf gouramis. I told them I had heard the males can be territorial and aggressive with one another. He assured me that in a 29G two would be completely fine since I have a lot of plants for hiding. Within three days one had attacked the other so severely that I returned one of them to the store. They did not issue me a refund on that fish despite the fact that, I feel, I had been given bad advice by them. So a couple of weeks later, went back to the same place (my bad!) because the options are limited where I live. Same guy recommended a school of tetras and I went home with 6 serpae tetras and was assured that they were a peaceful community fish that would do well with what I had. (YOu know where this is going!) Now, 4 days later, my remaining gourami, many of the serpaes, and even a few of my danios have their fins nipped like crazy. What do I do? Do I take them back? Should I demand a refund since I received more bad advice? I, unfortunately, do not have another aquarium to move them to. Will the other fish regrow their nipped fins? Any help would be appreciated!