while feeding my fish last night i noticed my angel couldn't eat. upon closer inspection i noticed the top half of his mouth was gone. I imeadittly checked my water and all tests came out normal. I had an angel die about 1-2 months ago from hole in the head or whatever but this looks different. he can't eat at al from what i can see. is there anyone that can help me and let me know if i can treat him? if so what should i use? if it can spread to other fish in the tank? i have 5 tiger barbs, 1 oto, 1 male guppie, and 1 rtbs. it is a 55 gal tank. and i don't have a tank i can move him to as a quarinteen tank. please someone help. if i need meds i need to go buy them o the ooner someone responds the ooner i can go to the store...