I just started using reactors, one for biopellets, and one for carbon. Haven't noticed much of a difference in the algae growth, but within a matter of days my acroporas started burning at the tips, in some cases badly.
Now, I also switched to sodium bicarbonate (un-cooked baking soda) for my alkalinity dosing solution at the same time, so the pH dropped a little. Now that I'm using sodium carbonate again (cooked baking soda), I saw a slight improvement, but definitely not a full recovery.
Not saying it's one thing exactly causing the problem (never change three things at once!), but for now I'm sticking with both the carbon and the biopellets to see if things adjust/algae problem gets better. If they don't I'm going to start taking one offline at a time to see if anything suddenly improves.
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