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Ok it won't let me upload photos but it's essentially tiny white specs of what looks like bacteria. It's also on the surface of the water. I have Melafix and SafeStart in the tank if it has anything to do with those.
I think it may be detritus. Just researched them a little bit. I have puffers, who are very messy eaters, and when you add that to the fact my filter is due for a cleaning as is all the waste on my substrate, I wouldn't be surprised.