10 gallon tank. Fully cycled. Ph 7.5 0 ammonia 0 nitrites 5-10 ppm nitrates Got 2 German blue rams. Only fish in tank. Fish has a something on it's tail fin. Possibly ick? Got fish Yesterday. Did a long acclimation. Over an hour. Kept lights off. The fish im worried about looks good. Is swimming more than the other. Hope the pic is good enough.