Welcome to the forum.... although it would have been nicer had you not had such a problem to deal with right off the bat.
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.
Can't find anything on the glow barb... other than the mention of glowing fish, sounds like a novelty bred fish. The variatus is probably a platy .
If you can send pictures of the fish, someone here will be able to ID them.
The cloudy water, on it's own, is likely nothing to be concerned about as it may just be a symptom of everything else going on in the water. Bacterial bloom, unsettled or new gravel/sand.
For the Ich treatment, read
this thread. It says more than I can about the topic... you may want to skip the salt with the Bristlenose, I think they are sensitive to it. Raising the temperature is the largest factor for clearing it out of the tank.
When you change your water (if you can do it daily that would be good right now) use a treatment like Prime as it will render the ammonia non-toxic for a day or two. With no plants the water aeration (filter making ripples, bubbler) will help. Don't bother with the pH adjustor stuff.
If you don't have a water test kit of your own get the API freshwater master kit as this will let you check your own Ammonia, Nitrites, Nitrates and pH. Also get the water supply data (call the water company or get it online) so you can get the hardness level as this can affect what fish you will be successful with... this should have already been done but many fish sellers just want to get you buying.
If you can get over this part, touch base here before adding anything else to the tank fish-wise. There are more considerations than just what anyone at a store will tell you.
Jeff.