Natural sea water has a pH of 8.2. Anywhere between 8.1 - 8.4 is fine, though some minor fluctuations out of this range can also be acceptable.
Keeping alkalinity at 8 - 11 dKH will keep your pH in check. If you need info on alkalinity/chemistry, read up on Beverly's links, it's stuff you'll want to know.
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135G Mixed Reef. Bullet 2, 25 gal refugium, 2 X250W MH + 4X 96W PC\'s, DIY Calcium Reactor, Coralife 1/6 HP Chiller, Phosban, Tunze, 2 closed loops & SQWD\'s, Seios, Coralife 4 stage RO/DI & a bunch of other expensive gadgets... I may never retire, but I'm gonnahavahelluvanaquarium!
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