Yup, its true feeding SPS with out knowing why and how can be more trouble for water quality as Brad and Myka both elaborated on
; but yet here is one more thing...i don't feed my sps, i feed my fish a good quality diet (spirulina brine, mysis, plankton, cyclopeeze and on pellet days GOOD quailty pellets) sooooo
good quality fish food=good quality fish poop
good quality fish poop=good quality bits in the tank water (that doesn't get skimmed out) that your SPS corals have access too...voila SPS food!
(but of course DO NOT feed extra to your fish). If there is one thing to take from my ramble it's this---Get a handle on keeping your nutrients low, and on keeping your Calcium, KH, Magnesium in the correct zones. This is actually the MOST important for the SPS corals anyway!!! Good luck, you will do great; especially with canreefers in your corner!