Looking for some help. We have an undistructable purple sponge taking over. It is strangling some zoas, and has spread to the euphellia gardens though it doesnt have a strong hold there yet. I have removed the rock it was on, exposed it to air for 5 minutes, then scrubbed it with a tooth brush to remove it. within a week it was back and as big as before. Last week, I tried to aptasiax it, out of desperation. It had no effect. Any ideas? Need this out of tank. Thank you.
