I've used seachems, revive, coral rx, ME coral dip, polyp labs coral primer, and fw dip. I honestly never could tell a difference. I wouldn't use freshwater dips on all corals, but the rest without issue.
If you are very concerned, you can brush the frag plug or skeletons on lps with peroxide and/or scrub them. I qt my corals too since dips don't stop eggs and aiptasia