My rescued betta, now in a 1gal qt, is improving slowly. I am doing 50% wc everyday, as the bucket doesn't have a filter. One of my concerns is that his gill flap seems to be a little extended all the time, even though he doesn't flare. Also, he has ammonia burns on and near his gills - red gashes too. And since he rubs against the walls, I checked for velvet, but it only seems like he wants more swimming space. Should I use aquarium salt to help him heal? Or is it just an irritant? I researched but couldn't conclude anything.