my betta's operculum is open on one side, ive been looking and nothing appears to be stuck. i l googled a bit and could this be gill hyperplasia? I dont see anything under the operculum as her breaths and i cant really tell if it is inflamed as he is a more orange red fish. i checked the parameters a few days ago when i was going to do a watcher change but i ended up just topping off the water cause the parameters were fine. he tends to flare at the nerites i have in there occasionally, could this be the issue? i have moved the nerites to another tank and added some salt to his tank.