Any small bits of debris floating in the tank water.
Do you run filter floss or matting in the filter.
Is the water crystal clear.
Noticed any more symtoms of parasites I left.
No, the filter cleared the water in about an hour. Water is clear.
I guess the filter has 'matting' but not sure. It's the standard sponges for the Fluval U3.
I can't see any other physical signs, and I was staring at both fish for a good 5mins to see anything. Therefore maybe 'normal' but I had not seen it before over the last 3 months.