Good luck, I used your battle plan in my Dino Battle of 2004-05 (also included increased alkalinity, increased flow, increased water changes, turkey basting, siphoning, replacement of aragonite sand with oolitic, addition of chemipure, you name it I tried it). Damned things stuck around for a year. At the height of the evilness I was putting the tank in complete darkness with a blanket overtop for 2 days. They still came back. Eventually I ripped out the sandbed and went barebottom, powerwashed all the rock and restarted the tank. Pretty drastic move but I've been dinoflagellate free for over a year now and am glad I did it
