I have one discus right now and was planning on getting more. I have a community tank with the one discus for now and a few cardinal tetras, 4 corydoras, and 3 khuli loaches. I’ve noticed that my discus has made some weird movements and rubbed against some of my plants every once in a while which I’ve heard can be a sign of gill flukes. He does seem normal and swims around and eats. When he eats however I noticed that he sometimes will start breathing a bit faster and heavily. Planning on doing a water change today. Is gill flukes contagious and if so how would I go about medicating my fish since I know the corys and khulis are scaleless fish and can be more sensitive to medications. Would I only need to medicate the discus since he’s the only one acting lethargic? Thanks Lucas