How much is too much?

Once my 75 gets a little more established and I get my lighting upgraded, I'd like to begin reefin'. I'm trying to figure out how many fish I should keep in the tank. I have 1 Flame Hawk and 2 Clarkiis. I also have around 25 scarlet hermits and 10 Turbo snails. My next fish will probably be a Royal Gramma. Would it be too much to also add a few green chromis? If not, how many could I add (I'd like to maximize the shoaling effect, but not at the expense of water quaity)?
My filtration is:
-65-70 pounds of live rock (at least 25 more pounds to come soon)
-wet/dry (slowly removing bio-balls)
-AquaC Urchin in-sump skimmer
-2-3 inch sand
-will be adding a refugium soon, as well
Thanks!
Pete
 
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