Ropefish sick, what could be the cause of it?

I have 2 small ropefish, 2 pictus catfish, 1 beta, and a ghost knifefish in a 20 gal tank. ( I will be getting a bigger tank since ropefish do need more space) I noticed that one of my rope fish has cloudy/films over it's eyes, swims sideways, as it swims to the surface it dives upside down and rolls around. I haven't seen it swim or float upside down so I'm not quite sure if it's swim bladder disease or not. I also noticed he breathes in through his mouth and gills a lot, kinda seems simultaneously, literally every second. What is wrong with him? My other fish and ropefish seems to be perfectly fine. No problems breathing or swimming. I dont know about the feeding part because i've never seen any of them eat (both ropefish). I've bought frozen blood worms and brine shrimp but i feel like they're going to waste and just dirtying up my water. I've placed it in front of them but they don't budge. So i just bought some feeder fish just in case. I've also started to clean my tank 25% everyday to make sure my water is not the cause of any problems..