I’m treating the my 150 gallon display with copper power and prazipro at the same time. I was maintaining copper around 2.0 until I added a gfo reactor and dipped to 1.43 so the cycle starts again. I also did one treatment of prazipro but left my skimmer running in fear water quality would drop so this time around I left the skimmer off and took out the gfo reactor. Just did a 25 percent water change last night and dosed prazi for the second time. When should I notice a difference with prazi in combating black ich I’m afraid it seems to have spread to my sailfin and gem tang as well. Can I confirm this as black ich? The first treatment of prazi didn’t seem to slow it down