Lights came on and he is now in one of his pvc homes. I have no powerheads small enough (I tried my smallest and turned everything into a tornado so removed). The airstone is quite powerful with descent surface agitation. Fish was eating very well up until the dose and happy to report I just put some food in and he came out and ate like he's always done, very well! And he's staying out looking for more bits in the water to eat. So thinking maybe just a rough adjustment to the copper and I panicked. Going to have to go slow getting to therapeutic level, thanks for your help!Copper has to be a gradual increase. So dosing it to therapeutic levels (copper power 2.0 ppm) in one shot would be harmful. I’d say try some sort of bath (ruby reef rally). Do you have surface agitation with a powerhead pointed at the water surface? Is the fish eating and has it been eating?