I've decided that its fungal, not parasitic. I came to this conclusion for two reasons:
1. I noticed that on my shower curtain there are spots that are the same kind of circular spots on my clown. Small, not raised, kind of within the curtain. This must be a mold at least in the case of my shower curtain.
2. As far as i know (b/c i am a phD student in molecular biology) infections at least in humans are caused by one or more (secondary infections) of four things: bacterial (if there are signs of pus), fungal (fungus, mold), parasitic (i.e. tapeworm), or viral. Most superficial infections without trauma (no cuts or scratches) are caused by a fungus (i.e. athlete's foot). I am no expert and I realize they are fish but he is eating well and still swimming actively. I hope at least from the process of elimination that if it is a fungal problem, it can be fixed on its own with time. Let me know if you have any more ideas. I'll keep you posted.
Thanks, Lilly