Well I wanted to stock my tank a little bit and purchase two 6in. Tin Foil Barbs with Angel my motoro stingray at 5in. Well for about 4 days he was fine. Today I looks at him there is a small chunck of his disc missing and on the edge of his disc it looks scraped and is white unless its the sand, but I'm worried. Should I get rid of the barbs asap or should I give them another chance? Please Help