gill covers

Hey guys so ive had my blood parrot for about 3 months now and he is about 3 inches. He has had the black stuff come up on him a lot but i know how to treat him for that. My main concern is his gills. They are super puffed up and there is like a really thin whit layer at the end of the gills...

One side of my gar's gill looks like this. Is that gill curl or damaged gill? It might've damaged itself since the tank at my LFS was pretty small and was pretty crammed.

Hey guys. There is a problem with one of the small feeder goldfish I rescued off craigslist last week. I will note that the rest died from stress and the ammonia in transport. (Long story, originally there were 5 common goldfish and 2 rosy reds! If you haven't seen my other post they were in...