I know that salt containing iodine is not safe to use, but what about iodide? They're two side to the same coin, but is one safer than the other?
I'm positive that it's velvet. I've never seen the yellow rust on him ever before, and it explains why he looks so 'dusty' recently. It's not like any iridescence I've seen, and looks like grains almost.On that note, do you have pictures or another thread that we can help out with? Often times, what looks like Velvet, is only iridescence and isn't actually the parasite.