Something in my tank just isn't quite right...

[amy]

and I can't seem to figure it out. I'm sure it's probably something I'm not doing right, or maybe I'm missing an important item??

Let me see if I can explain my tank. (still struggling to learn all the terminology)

I have a 90 gallon tank, I've only had it for 6 weeks myself but it was transferred from a (supposedly mature tank). It is not drilled, so has an overflow box that hangs over the back. I have a 30 gallon sump (I think), I have a protein skimmer and live rock rubble in the sump as well. I have an ATO set up in a 10 gal tank.
I have a TEK light fixture 48" 6 bulb with a mixture of bulbs, some white, some fiji purple.
My water paramaters seem ok.
Temp 79
Salinity 1.024
Ph 8.2-8.4
Nitrates 0
Nitrites 0
Ammonia 0
Calcium 380-400 (currently using purple up to boost it a bit)
Phosphates bounce between 0-2

The tank cycled quickly (within a week of set up). At about 2 weeks post set up I added the clean up crew, by 3 weeks started adding my livestock.
It currently consists of:

2 clowns (sabae I believe)
melanurus wrasse
regal tang
lawnmower blenny
mandarin goby
Bubble tip anemone
Frogspawn
some mushrooms
5 small zoa frags

My water seems cloudy and full of particles, my non fish livestocks colors seem duller than they were in store, my zoa's seem flatter and not perfectly round anymore. I am also feeding Marine snow every few days, and of course food for the fish too (daily)

Do you think I'm doing something wrong? Am I filling it up too fast? Is it just an immature tank that needs time to flourish?

I would appreciate any advice, thoughts or suggestions anyone may have?

Thanks
Amy