My daughter loves fish, so for her birthday we decided to dive in and get a 20 gal tank for her. My husband works with a guy who sells fish, so I let them handle all the details. Well, now I have fish freaking me out, and the only one I actually know what it's called is the bristle nose pleco. We have 4 fish he called orange glo barbs, but they're actually yellow, and 2 that he said are "variatus" which I've found no information on at all. When he delivered the fish he tested the water, added some chemical to fix the ph, and let the fish in. I did a partial water change 2 days ago, which a gravel vacuum that did not work. Since then the water has been cloudy. Last night there was white stuff floating at the top of the tank. I scooped it out with a net. Today they've all been staying towards the top, one of the yellow ones keeps "playing dead" floating to the top, then floating down or doing back flips. The pleco was even going to the top, but for the most part has stayed on the same part of the wall since yesterday. The guy we got the fish from "may or may not" come by and I'm worried about them.