My mandarin has had the same white spots since shortly after I got it. It doesn't look like a parasite, it looks like loss of pigment. The spots seem to move around and they go away at times. I think it may be stress related. There is a lot of flow in my setup and even though there's a ton of pods in my fuge, I'm not sure he's eating well. No one's posted on this thread for a while so I'm assuming that your dragonet is fine now? Just thought I'd chime in since this is the only thread I could find on the subject. Thanks...xltom