It is only advisable to remove/squirt aiptasia in the mornings, as in the evening they will release their spores if threatened and spread throughout your tank. I did as you did and used aiptasia-x at night because it was the only time I could do so. The next thing I knew the tank was infested. I picked up a few berghia from monocus and now they're all gone. He was the one that informed me that, and that is how he breeds/feeds his berghia factory. He disturbs the aiptasia at night so they will breed and be able to feed the berghia.
