Welcome to AA, Badblood!
If you removed the carbon from the filter, replace it so all the meds are removed from the tank. The meds will kill pretty much everything in the tank. Next time ich strikes, be prepared by reading the article on FW
ich in the articles section. Treating a tank with high temps is better for the fish and the bacteria in the tank, which I would be concerned about. If your tank was already cycled, it may be cycling again due to the meds. Take a reading of the water parameters (ammonia, nitrites and nitrate) to see if your tank is re-cycling.
My plecos love zucchini, peas and algae wafers.