Spiffy
Cheesy Poofs!
Aiptasia are animals. There arent any "spores". In theory they could spawn, but in practice they dont spawn in aquaria.
In your aquarium they reproduce by pedal laceration -- ripping off tiny pieces of their foot (the pedal disc; what they're attached with) each of which grows into a clone of the parent.
So anything you do to disturb them makes it likely theyll spread. Also, if you leave them alone, they'll spread.
Peppermint shrimp or filefish! These always work for me.
+1
Peppermint Shrimp did it for me. I haven't seen one for years. But now that I have found a few on my rocks...