I am purchasing my first clam soon and am looking for any pointers given my tank. I have a 20 long with 150 watts VHO, been keeping SPS for a couple months now with great results. All levels are good, and the tank seems to be very stable. The clam is a squamosa, around 1.5" I am going to start dosing DTs more often, but how often and how much is a mystery to me. Any info that may help would be appreciated.