Clownfish with dark spots

Ok, so my occ. clownfish has had dark spots on her for awhile now. She eats good, does not scratch, no heavy breathing, nothing. She acts completely normal... for her..
Now with some history.. this fish was in a tank with HIGH nitrates.. 100+.. before i got her. She changed tanks about a year ago. She didnt start getting the spots until she got in the new tank. I have heard that clowns get this pigmentation as they age, but i thought i would check with you guys. here's the important info, and i have some pics.

PARAMETERS (important)
Temperature: 78
PH: 8.2
Ammonia: 0
Nitrite: 0
Nitrate: 0
Salinity: 1.025
dKH/KH/Alkalinity: 12
Magnesium: ?
Calcium: 450
Phosphate: 0
Test kits you own: nitrate, nitrite ammonia, ph, dkh, calcium, phos
Liquid or Strips: liguid
Brand Name: API
Are they Expired?: nope


Tank size? 36 gal
Estimated total system? Around 36 gal

Reef, fish only or, freshwater? reef

Current inhabitants? What and how many? Carrie, Terri, and Sixy …… 1 occ clown, 1 black occ clown, 1 six line, 1 coco worm. Some zoas, mushrooms, and a torch
Clean up crew? 7 hermits, 15 astrea snails, 2 mex turbos

How long has your tank been set-up? 1 yr

Substrate.
Type? CC
Depth? 2-3 in

Live rock? y
How much? 60-70 lbs
Did you recently add some? nope

Filtration.
Type? Canister, fluval 205
Protein skimmer? Not really…. Berlin airlift 60
Do you wet or dry skim?
Maintenance schedule for filtration? Clean with water changes… about 1 time a month
Drilled tank/hang on back overflow? NA
Sump/refugium. What's in it and how much? NA
Macro? What kind? no

Lighting.
Lighting type? 2 x 65 W PC, one 10K, one actinic
Age of bulbs? 4 months

Feeding
What? Ocean nutrition formula 1 flake, formula 2 pellet
How much? Sml amt, what is eaten in 1-2 min
How often? Every other day

Water change schedule.
How much? 8-10 gal
How often? monthly
What salt brand? oceanic
Water source? Culligan RO machine

Additives/supplements used? Trace elements q 1-2 weeks, iodide q 2 weeks, calcium q week, strontium/myo q week, zooplex and marine snow 2 x week

Do you have a ground probe? no
What kind of flow does your tank have? 725 g/hr. . . 20x turnover

Any additional info you would like to share.... Including anything different that you have done/not done.

Let's get to the bottom of this. Any of the above info that is questionable to you is pertinent to keeping a happy/healthy tank/wallet.

 

Doesn't look too abnormal and if its been going on for a while and the fish seems healthy I wouldn't worry too much.