Prime HD setting Shallow 8" deep Zoa frag tank

Danmuges

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I'm after a little help.
I've had my frag tank set for a about 2 months now but I am unsure if I have my lighting setup right. It's a shallow 8" deep tank with ai primes mounted on the longer 18" flex arms. I've noticed a lot of my Zoas have opened around 80% and some are stretching towards the light but the utter chaos are losing their speckles and showing signs of getting too much light. My question is what would should have my whites set to? Currently they are set to 20 but I'm not sure if this is too low. I also don't have access to a par meter. Does anyone have a similar sized tank and have some advice? I've attached an image of my tank. (no lights on).
I did move a few frags into my display tank and the polyps doubled in size and completely opened..

20190119_075050.jpg
 

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