Hi guys I have a stable Datnoid that has been doing bad lately . Yesterday I feed him him and he was doing good but today I check all of sudden he’s swallon it’s like his whole body. I don’t know tell what’s the actual problem but I checked the water and ammonia and nitrite are 0 and nitrate being at 5 ppm. I did a 35% water change to be safe. Is there any medication I can use to treat it tonight. He’s being swimming oddly and slow and he’s having trouble

