rubbing

Tank Filters: OASE Canister, Fluval C4 HOB and a Large Sponge Filter. Ammonia: 0 Nitrate: 10-20 PH: Close to 7 Tested with API Liquid Test Kits. Plants: Java Ferns, Hornworts, Water Lettuce, Marimo Moss Ball, Anubias, Photos. I have a juvenile Snakehead fish in a 3 x 1.5 x 1.5 feet tank. The...

I have had the fish for 3 years. Raised it from fry. It is 10 inches now and scraping constantly. He always did it a little bit more than the others, knocked some scales from time to time but never to the point of concern. But now he is messed up, stopped eating and staying in a corner. He never...