It's hard to say what it would benefit and what it wouldn't. It's meant for coral and other inverts like feather dusters and fan worms that are "filter feeders." Some people, for example, don't use any product like that for their zoanthids and rely on photosynthesis for their sustenance, while others feel that they do benefit from a product like that. But if you have any of the kinds of coral or inverts that definitely will take phyto, then you should add it. Be careful though, not to use too much as it will add to the nutrients in the water column and micro-algaes and cyanos will take advantage of that.