about a week ago i noticed my fantail goldfish sitting at the bottom of the tank, i immediately did a 30% water change and until yesterday he seemed perfectly fine. Yesterday he was sitting at the bottom again. I did another water change and looked closely at him to see if there was any visible change with him. I discovered 2 white dots one on his dorsal fin and one on his tail fin. I thought it could be ich because i don't have any experience with that so i wasn't exactly sure. I left it for the night and checked on him this morning and found that the white dot on his tail was now more of a hole than a dot it was red around the edge but on the inner side of the tail there was a white bump where the red hole is on the other side. The white dot on his dorsal fin still looks the same as yesterday. So far he hasn't been sitting at the bottom of the tank again and he is eating and behaving fine. The water parameters are completely normal. In the tank is also a shubunkin and a hillstream loach. The tank is 20 gallons and the goldfish are still small, was going to upgrade soon but need to sort out this issue I have no idea what it could be. I've attached some images, but the fish get excited when i go near the tank so it was hard to get a good pic. It would be great if someone could help me with whats happening
