I think you need to let coral stay in there for 76 days (count it individually). E.X. introducing new coral won't reset the 76 days clock for the existing one.
That is what confuses me. If batch one of corals are nearly done, and you add batch 2 and in with batch 2 come ick or MV, won't those cysts or swimmers or whatever they are called, latch onto the corals in batch 1 and then transfer into your tank?

