There's several ways to raise ph and alkalinity. A good two part supplement will do the trick, get it at your LFS. Go see Tim at Keen Reef, he'll help you out. You may want to investigate the DIY products at http://www.bulkreefsupply.com">www.bulkreefsupply.com</a> as well. Good reading there as well. Baked baking soda will do it. Bake at 400 degrees for an hour to drive off CO2.
8.1 is not bad for ph, so try not to overdo it. Getting your tank cycled is an exciting time! You could have peeled me off the ceiling when my first tank was ready. Just remember to take your time and don't get in a hurry. Good thing happen slow, bad things happen fast. Check out reefkeeping magazine online, a lot of good stuff in there.
Have fun!