Really depends what you are wanting. For me, night club it up! I'd suggest getting rid of the two 65W 50/50's and replace them with full actinics. I recommend UVL Actinics from BRS. They're Awesome! That alone will make a big difference for you in getting the "pop" out of your rics and zoas. That's where I'd start and that's the cheapest to start with. Try two on one side for now and compare to what you have on the other side.
The more blue you go, the more intense the colouration will be in your corals (usually... it's not always the case). Some people go to 20K's for exactly this reason... but with the sacrifice of growth. I find a lot of 15K bulbs to actually be a little blasse. The only mid-K halide that I really like are the Phoenix 14K's. They are more blue than your average 14K or 15K but still give pretty good growth. I love 'em and likely won't switch to another bulb again.
Just from my own experimentation I have found rics and zoas LOVE flat, blue light... like what you would get from a T5 fixture with actinics and purples. Using actinic PCs will help with this when using halides.
One question I have to ask is, are your zoas and rics brown (low water quality, no light) or stressed out (pale,dull)? Not doubting your reefkeeping skills; just want to make sure lighting in the cause before you throw $$$ at it.
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