I recall seeing something about when one die's off it sometimes releases it's branches. Hence you might have your cause/effect from your injection. The leftovers of the original ones you killed spread and "Breed" so to speak.
Anyone else hear that? I've a smallAiptasia issue in my 75gal but just got a Peppermint shrimp to handle it early. So far he just stands around shaking side to side.
75gal Salt, 18gal Sump, Skimmer, 60lb Live Rock, 90lb Live Sand, 3 Pwrhd, 2x55w Actinic, 2x55w 10k. Guest list: Goby Green Clown, Percula Clown and entire clean up crew.