I did the dip today, the PH up API really works, I only needed a couple of drops for it to reach a 8.0 PH. I caught my flasher wrasse as I suspected really quick with the fish trap, I gave him a 5 mins 30 seconds dip, absolutely nothing came out unfortunately.I was really hoping it would be flukes, but now I have no idea what they have, but out of my 5 fish, I have seen them all flash at least once, some days 2 or 3 of them are flashing occasionally, then they stop. Most days they don't flash at all, but lately I had seen them flashing at least one day of the week. When they flash they seem to do it on the gill specifically, they have never had white dots, and it is definitely nothing that kills quickly as I have observed this behavior for months. Which is why I was so sure it was gill flukes but nothing... At least I won't have to dose prazi pro for nothing.It is definitely not ammonia, nitrates or nitrites, and my PH is fairly stable. Is there any other disease or external factor that could possibly match this other than ich on the gills only?. All fish have perfect skin and absolutely no behavior changes other than flashing some days.