I have a 55 gallon saltwater tank. I live in the Bahamas and catch whatever is in my tank. To be honest, I am not a good fish catcher so my collection of fish is limited. I do have lots of crabs, brittle stars, urchins and other slow moving beings. My problem is i had an anemone ( i think it is a sponge anemone). One day the anemone disappeared after several years of living in my tank. A while later, i noticed babies growing. Alot of them. I now have aprox 150 of them in my tank. Q is: How many is too many and how do i get ride of 99.9% of them without killing them. They are on my rocks, in the sand and on my shells.