I think it was a combo Henry. The treatment you and I have discussed and done, continuous removal, no water changes, lighting was cut back and feeding as well, no feeding for corals, weekly pruning of chaeto in the refugium, keeping ph 8.3 or above, adding more snails of all varieties, keeping temp and salinity lower rather than high, and adding this beast of a filter was a major help. I stuffed it full of chemipure elite and fine filter pads. It also has several big sponges in each basket. The battle is not over, but almost. I really hate that dark brown algae that is in there, but I can live with it!!