I've have a Jewel in my tank with an oscar and a few Africans (Yellow Labs...) It seems he is breathing kind of heavy, I checked his gills (visual) and there were no parasites to be found. This may be normal as I see him rarely in my tank as he is always in the plants and caves. He seems full of energy, eats, locks jaws and wrestles with the labs. I just noticed his mouth "gasping" but again it may be that jewels do this?