I haven’t been able to find any pictures that look exactly like this. I don’t think it’s serious because he had something similar ages ago but I was assured by the breeder I got him from that it was just debris caught in the gills and it was nothing to worry about. It went away soon after and he’s had no issues up to now. I’ve noticed no change in behaviour or any other physical abnormalities and he actually dislodged one of the white things. They aren’t attached to the gills in the way it shows in the first picture but are instead like a string hanging from a tiny area that drags behind him. If anyone can actually give me an answer on what this is that would be great thanks.