oh boy good luck treating.incase you dont know how to: remove the carbon from filter(you have done already), raise temp to 84-86 f, treat as directed on bottle or go less than suggested dose, and treat for atleast 3-4 days after that last ich spot disapears. i find that a huge gravel vac before treatment helps a lot, i guess it removes most of ich cysts hidding in the gravel. you can expect plastic and silicon parts int the tank to turn blue, possible deaths deaths....dont mean to scare you, its just that tetras are lot weaker to ich meds than most other fish. a lot of stress, on you and the fish. some of the others can give more info........this is all i can remember/think of for now.
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