PH rising and falling

Fastf1-chuck

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260g tank 90g sump 6 months old
triton core 7 system for 3 weeks
10 small fish 8 small corals so just getting started
when testing with red sea test kit +calcium & phosphate
all test show really good levels
11.000 gallons of water circulating per hour.
sump kessil halo h380 algae grow light on 9:30pm off 7:00am
blue light on 10:00am main lights on 11:00am mains off 7:00pm blues off 9:30
the room is pretty dark for the most part so not much if any for out side light
when the lights start to come on at 10:00am PH 7.95 then around 11:00pm PH tops out at 8.17 and has been hitting these levels pretty consistently.
just wondering if I need to be concerned with the rise and fall of my PH levels
 

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