I just bought klein's butterfly and it fought my yellow tang so I had to put the tang into a 30 gallon tank and the butterfly is supposed to eat he aiptasia I have we plan on reintroducing the tang and since it is introduced last this time will it still be aggressive towards the butterfly also the butterfly keeps Nipping at my zooanthids so I am worried about my coral
Any butterfly can be a problem with corals. Klein's are one of the most likely to be reef safe but it's never a sure thing. Zoas, palys, and meaty lis are the most at risk. As for the tang, your plan is a good one but whether it will work or not will have to be seen. Good luck!