bobbie- try using a ph stabalizer, it raises alk as well, they are pretty cheap too.
crushed coral will disolve and increase the amount of calcium carbonate, making your gh test higher, shouldn't harm shrim though.
don't think of your ammonia going up when you add it as starting from square one, when this happens you are making the cycle stronger. the higher your ammonia is durring cycle the more bacteria you will have.
i know people who did a 4 week cycle on a reef tank. the first week and a half he kept ammonia way off the charts. by the end of the fourth wek everything was stable. 2 days later he added all 11 of his fishg, including a huge achiles tang.
never had an ammoina or nitrite spike, and nitrates are at 0-2 consistantly.
hth
and just because i saw someone post tis on the first page.
the bottles to help cycling aren;t fullof "good bacteria" its full of a catalystic enzyme( redundant?) that causes them to breed fatser. 8b