You can pick up potasium permanganate at places that cary Jungle products. It's labled for fresh water as "Clear Water". I have a friend that had been having nudi problems for a while. He started using a diluted dip of "Clear water" on his colonies and has mostly exterminated them all. I have seen 2oz bottles of this stuff at Walmart and 4 and 8 oz bottles at petco/petsmart. It's also good for a quick ORP increase. 5ml will raise the orp about 50mv in a 225gal reef in my experiance. So far in the 15 years that I've been using this stuff I have never seen lasting ill effects in any aquatic environment. Xenia shrivel up abit but come back after an hour or so.
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