i dose phyto, sps dont eat it tho...............it feeds zooplankton,pods and the like .....................i have used liquid life coral plankton which is dead rotifers, just doesnt seem to last long..............i see roti-feast is dead rotifers as well so thats why i was eyeballing it.................i did some searching , alot seem to like rods but its rather expensive....................just wanted more input from those that use these...........