I stay on 0,5 today, and he had more than yesterday... will see the next days. There are some white spots that are resistant to copper? Would it be ok if I had rally reef to the copper treatment, as rally reef seemed to have helped the fishes prior?
Marine ich has some variation in species throughout the world - but the differences between them seem more related to temperature and salinity. "Copper resistant ich" is sometimes mentioned, but I've not seen it myself, other than severe infections can take time to slow down and stop, especially with coppersafe or copper power.
Jay