That seems like a lot of light so the DIY CO2 might not be enough...
I'm running a BC29 at home so the values should be close, from memory...
Dose this Sunday, Tuesday, Thursday....
KNO3 ~1/4 tsp
K2P04 ~1/16th tsp
Dose your micros on Monday, Wednesday, Friday.
Do nothing on Saturday.
Sunday, do your water change, trim, whatnot. When refilling tank, add GH booster if you want.
None of it's set in stone, tweak as needed. Dose twice a week if you want to, etc. Experiment. I've been following the schedule above until I make sure I'm consistent and everything recovers from my scorched earth method of dealing with snails in the old tank.
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S