I’ve had a blue tang, yellow , scopas and lavender tang in my 100g and occasionally the yellow and scopas go at it but not often. All the fish including the blue tang seem to be eating like normal however the blue seems to have a few (maybe 4) specs on him and hides in the rocks and scratches sometimes…not sure if I need to remove him as all the other fish eat well and show no signs of illness. As it as FOWLR tank can I dose the main tank or should I remove all the fish? Not sure if this is ich or flukes or velvet or whatever. The blue tang again isn’t covered in spots and does it but not sure what to do, if anyone has any ideas let me know!