1) Water changes. Easy to ignore, but the results of consistent water changes I think are the best thing ever!
2) Good lighting
3) Two part (but if you are not doing enough water changes then watch magnesium as it could fall low)
4) Good skimmer
5) NP Biopellets (or the vertex which are cost a bit less).

Every now and then I put in a few drops of Lugols, but I am not sure if that is really doing anything or if I am just superstitious