It is perfectly safe to use. However, i wouldnt use the whole thing at once or anything crazy like that lol. I use it all the time and have never had any trouble with it. Just be sure to get it in the mouth and get the entire thing, if you leave any it will just grow back
180g Reef - 60g Rimless Reef -90G FOWLR- 125g Malawi Cichlids- 40b REEF- 34g Fresh Planted-working on- 20L FOWLR- working on
I have a mix of many different saltwater fish amongst my tanks, but I love my Tangs most of all.