Any sort of application process should be done with all water movement pumps and filter returns off.
Secondly, it is incredibly hard, and will never be completely successful. The only way I have ever gotten rid of all of them was with peppermint shrimp.
Others I know have had success with copperbanded butterfly fish, but they are hard to get onto prepared foods after eating aptasia for so long.
I have 5 tanks all totally covered about 2 million little ones every where in gravel in filters on decor on the top the heaters even .The tanks are full of LG triggers and LG puffers there all very aggressive tanks they are from 55g to 125 gal
injections would take about 200 years to complete on all the millions on little ones and adding cal paste I would need about 5gals of paste at least .
Is there any other options