It's been at this temp for almost 2 weeks, and never had a problem. And I've treated for ick once before without problems. I'm wondering if it could have been from my dosing, as these GBR's are troublemakers, lol. Anything you put in the tank they have to get right in the middle of, lol. I may have to feed at one end to get their attention, and dose on the other end. Not sure if going into the cloud of CSM+B could have caused this. None of the other fish go where I dose, only the investigating GBR's, lol.
Edit:
I just did filter maintenance on my XP3, as the flow was getting bad. The main coarse sponges were completely plugged, so I'm sure the filter was only running on bypass. I've been doing this every other week, as the XP3 had been getting so full of gunk from plant matter. Maybe I should clean it every week, lol. Now I have more flow as well, and also turned my CO2 down a bit. I don't thing it could be from elevated CO2 levels, as I've had it much higher than this. But who knows. Most of them are now swimming normally, only a couple left at the surface. So it's either low O2 or too much CO2 that's doing it, or from going in the cloud of CSM+B. I did turn up my air bubbler more as well. But with plants supposedly giving off O2 when the lights are on, not sure why this would be happening during the day. I'd hate to have to turn off my CO2 til the ick treatment is complete.