What kind of water are you using? IMO ro
is a must have... There are tanks out there that can do well with tap but they are very very few.
Nothing should be added to your tank unless you test first. Do you test? and if so what are your readings. Calcium and alkalinity are the only things I add to my reef and my tank is doing very well. Check out my gallery.
What kind of lights are those? I have friends who have mH
lighting and there coraline grows very slow, Im not saying it impossible to get coraline with MH
it just seems to grow slower with the bright light. Maybe some different bulbs may help out.
My tank took about 1.5-2 years till things started to pop and the coraline took off. And I tested daily and added my 2 part B-Ionic cal and alk
additives. From what I read you need to keep the calcium and alkalinity in balance for the coraline and some corals to grow well.
I used DT's for a few years now I use liquid life coral plankton.