say zooplankton and others say DT's is there a difference?
DT's is the name brand. They make phytoplankton (DT's phyto) and zooplankton (DT's oyster eggs). Cyclop-eeze is also a name brand/type of zooplankton. Oyster eggs are much, much smaller than cylop-eeze. Besides coral, fish such as anthias, chromis, clowns, etc. will appreciate cyclop-eeze. The other two foods, phyto and oyster eggs, are for coral and pods
only. They are too small for fish.
FWIW your tank/coral will do just fine w/ only good lighting and fish feedings(If the clam is under 3" it will NEED target feedings of phyto- over 3" light alone is enough). I would actually stay away from or be very cautious w/ feeding phyto or zooplankton w/ such a new tank. Nutrients are usually an issue w/ newer tanks to begin w/. If you notice algae or other issues discontinue feeding for a few days and then cut back on the amount in the future. I would recommend you start w/ cyclop-eeze first if you can.