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That's what I thought, if you do some searching on the arm extra course you'll find most run ph a bit lower than that. I've got a newly calibrated ph probe and a tank that the alk demands aren't being met when the ph is 6.5-6.7. Since I've started running lower ph alk has stabilized.
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211g Planet Aquariums Hybrid PVC bottom 48"x34"x30" and steel stand from CustomReefCreations - Reeflo Super Dart - OM 4way - SRO XP3000 External - ATI Dimmable 8x54w - Apex.
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