Revive for most corals
Interceptor for red bugs and other microcrustaceans for sps acans chalices when infested.
TMPC or Lugol's as an iodine dip for brown jelly or other infections. Difficult to cure and may not work . Sometimes a frehwater dip works but many lps corals don't tolerate it well. SPs don't tolerate it at all, ime.
Zoanthus also respond well to revive or a 5 minute freshwater dip.Either casues certain irritants like asterina, pods, sundial snails etc to fall off.
Salifert flatworm exit is useful too.*** a dip.