As 6 hours of light may be enough, this will all depend on the quality of the fixture, bulbs and age of things... Maybe try increasing it to 8 hours, and give it a month and see what happens, then maybe 10 hours.
I personally use Ushio 10K bulbs for growth with t5HO actinics and have my lights on for 11 hours with no negative impact and the corals seem happy.
Just another suggestion if you feel other areas are ok.
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Setup: 180G DT, 105G Refuge (approx. 300lbs LR, 150lbs Aragonite)
Hardware: Super Reef Octopus SSS-3000, Tunze ATO, Mag 18 return, 2x MP40W, 2X Koralia 4's Wavemaker
Lighting: 5ft Hamilton Belize Sun (2x250W MH, 2X80W T5HO)
Type of Aquarium: mixed reef (SPS & LPS) with fish
Dosing: Mg, Ca, Alk
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