The best accelerator is keeping your alk/cal/mag stable. Also, coralline doesn't like high PAR, and seems to love blue spectrum. It will take off in the lower PAR areas of your tank. Yes, those little spots will grow larger and larger. Mine grows in overlapping expanding circular patterns.Yeah man I was surprised to see new little tiny purple spots everywhere in my tank only a week later after adding that purple helix!! In some spots now I see a different strain of like a pink color coraline, like on arc reefs premium live rock! I guess those little spots will just keep growing and growing bigger and bigger? What is the best coraline accelerator to add to help it grow without causing any problems with the tank in any way?