It is very easy to make a mistake with Cu solutions, it doesn't take much of an overdose to kill you fish (which are already stressed from the ich). I prefer a formalin/malachite green solution (you can pick this up anywhere, and it's cheap). It is going to take a while to knock it back. Just keep in mind that the life cycle for both of these critters is ~3 weeks (it's dependent on temp), and only one stage (the free-swimming infective stage) is realistically treatable. In other words, you need to treat continuously for at least 14+ days in order to make sure you kill ‘em all. Most people make the mistake of quitting treatment once all the white spots disappear (this isn’t even the stage that you’re treating for). The best way to avoid problems with ****** is to use a quarentine tank to begin with. Just keep in mind what ever medication you use, that to follow the directions on the bottle and/or someone who knows what they are talking about. The most effective way to take care of ****** is to remove the fish to a quarentine tank for treatment and allow your main tank to remain fishless for at least 4-6 weeks (the ****** need the fish host to complete their life cycle, and will die naturally without them). Keep in mind that adding any medications to your main tank could potentially kill of your beneficial organisms as well (including your denitrifying bacteria).
