How to determine proper flow?

[dacookster]

Hey there, I've been doing this for a couple years now but have an 8 month old 60G cube up as my primary. Right now it has a Koralia 750 and a 500 facing forward at the back on either side. It is a reef setup with some monti's, acros, zoas/palys, mazes etc. Most of the LPS and SPS have been in there for about 3-4 months and I'm not quite seeing any relative growth, except for a red dragon thats going crazy. All along I've been concerned with water quality/chemistry and lighting (LED build) but I'm wondering if flow (too much or too little) is at play here. Any thoughts?