I don't suggest anything that claims to speed up your cycle or introduce bacteria. There will be more than enough bacteria and decaying matter on you live rock to do the job.
Well I've never used the stuff. But I'm sure it is just going to introduce some of the aerobic and anaerobic bacteria in an effort to speed up the nitrogen cycle. Potential down sides would be the introduction of other chemicals present in the bottle to maintain the bacteria and spending money on an item that is free.
Speed vs stability in my mind. But, just my .02, maybe someone has used it here.
There are 2 types, 1 for FW and another for SW. Well, i better leave my tank to go through normal cycle instead of speed up. I want to ensure there will be no issue when i introduce new fish. :mrgreen: