My 75g tank has a few corals 2 clowns and alot of liverock, close to 120lbs. THe liverock came with a little aptasia and i didn;t think it would escalate to this. I have aptasia bad. there is many many aptasia babys on the sand bottom and it looks awful, i had a kalk type pwder to kill it but it didnt work, there is probably 10 large aptasias on the liverock that need to go, i really would like some advice on what i can do to save my tank.