Seamaiden
Living dead girl
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If someone's having problems, say in a UC, they could use the type of O3 gennies that are used in aquaria and as long as they pay attention to ventilation and other safety issues, they should be ok. I mean I don't know anyone outside of Florida who keeps a reef tank outside, and I know many, many who use ozone generators. That means they're using them inside. That said, a chem prof I know refuses to use O3 gennies in his home, and I think we can include his office there, too. But if you've got a bad case of Cryptocaryon irritans and you can't catch those fish to dip 'em, you might be willing to go the ozone route.