My moms teaching assistant took in their class betta ~1-2 years ago. Apparently he is not faring well, because the teaching assistant sent my mom pictures of the betta after he burrowed into his gravel. There were a few terrible photos and ultimately i told her to do a 50% water change and take out half of the gravel so he cant bury himself and put him in a dark room so he is less stressed. She is bringing him to their classroom tomorrow and he will be coming home to me. I plan on getting sand and maybe just a new small tank if i can find one to medicate him his fins seemed clamped and a bit torn and he is probably not getting enough oxygen so i will add a sponge filter. Is there anything i should medicate with? I figure aquarium salts would be best but i dont know if i would dose the whole tank or not. Does anyone know how to help? I will attach all photos sent to me.