+2, or +3 I do feed my corals (LPS and such) because I am looking for greater growth rates, you do sacrifice water quality (so be prepared for more water changes/Maintenance) if you don't have a large enough clean-up crew but if you are looking to push growth then I would suggest to feed, brine, mysis, marine cusine, etc. I feed my maybe once a week with the full load ( full load doesn't mean a cube of each, just enough that there is a good mix out there), making sure everything that will eat gets what they need. I have Acan, Duncan, Candy Cane, Trumpet, Frog Spawn, Hammer, Torch and Open Brain (oh and Glaxia) Think I got all the LPS covered...lol I do hit my frag tanks as well when I have LPS in those; for example I have a plate that I fragged earlier this year, I make sure that gets plenty to eat so it can grow as well.
OK hope that wasn't too confusing but just a take of it. Oh and by the way, when I don't feed everything does just fine just slower growth.