It sounds like you added way too many fish to your tank way too soon. If you'd read up on the tank cycle, you would realize that if you add too many fish, the ammonia levels in your tank would rise to deadly levels. It sounds to me like your fish are being poisoned slowly and painfully. When you cleaned out your tank, did you use any cleaning chemicals? That could be it, or it could be just ignorant ammonia poisoning. Fish excrete (poop) ammonia out into the water, so essentially, unless you cycle your tank, they are swimming in their own crap until you have some bacteria growing in your tank so that the bacteria eats it. Immediately do a 50% water change. Then get your mom, brother, dad, sister, SOMEONE to take you to the fish store with a sample of your water (please return the living fish too). They will test it for FREE. Ask them for the numbers they come up with, and post those numbers here. Those are your "water parameters." They measure how your bacteria colonies are growing in your tank. Fish will not live in uncycled tanks, and no product will remove ammonia, nitrites, or nitrates, so if someone sold you that, they are full of BS.
Take all the fish back immediately today. If that isn't possible, immediately do a 50% water change (treat the water with water conditioner as you add it). And answer my questions from this post. If you don't plan to do this, please quit posting and wasting our time. We shouldn't have to listen to endless decriptions about what your fish look like since you don't know what they are.