My Clown Loach suddenly got a weird, red ring/spot on it. I am not sure if it is sick with some sort of infection or parasite? It is a singular red dot. However, one of my other fish is behaving sluggish, gasping for air and has some white film on a very small part of it. I regularly clean my tank and have never had any illnesses before. Any help would be very appreciated! I have never encountered a red spot before.