Pearlscale goldfish. Originally not like this. Has red streaks/spots on face+ body+fins. Looks like hes gasping? I've done some research and I suspect it is red pest disease or dropsy but Im not sure. My mom says that its bcs of overfeeding. Recently, I fed my fish some ghost shrimp along with fish food.(Maybe he has allergies???) But I dont think overfeeding would lead to this. (Besides, pearlscale goldfish are chubby, no?)Last 2 pics are my other fish for comparison if you need. If u need to know, my tank is 35×30cm(approx). I changed water js yesterday. He's only occasionally swimming up to hide in a corner, getting bumped around before falling back down. I dont have a hospital tank, but I do have a small container for pregnant fish that can be put in the tank.
Sorry guys.Im still sort of a beginner in fish keeping.