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Tanks started with dry rock have always been more challenging with sps corals. They lack all the proper bacteria and micro fauna that so many corals seem to need. Bottled bacteria is no where near close to what came on rock from a reef, its mostly just nitrifying bacteria. It will cycle a tank and is fine for a FOWLR tank but a reef needs more. Adding a decent amount of live rock, adding frags with small pieces of rock attached, live sand from an established tank or the ocean or rock from an established tank will help add the needed things that sps need. It does help to keep the water "dirtier" earlier on as well. The added nutrients help things get going and stay healthy.