1st alk prob in 9 months/ need help

[Orion80]

I have read both the reef central and the advanced aquarium online magazine threads on alk/ calcium probs, and well they have not really helped in my problem. So here it goes,

My ph is really low 7.8 with the lights on, my alk is throught the roof sitting at 5.71 mq/l or 16 dkh and my calcim is at like 290. So I know to add just stright calcium to move increase my calcium levels, but will this help bring up my ph.

Only recent changes was added a bunch of sps frags to system and have temporarily stopped useing my kalk drip. B/c I am in the middle of adding another tank to my system. Just recently added 2-150watt hqi hm w/ 2-96 watt atinics. Current tank is a 75 gln with a 35 gln sump/refuge with 110 lbs live rock and about 160 lbs live sand between fuge and tank.


Any and all suggestions welcome.
Thanx in advance.

Adolph Z.