Been using TM Bio-Actif for a couple of weeks (2 15% water changes) and haven't noticed a difference in terms of livestock, but did have a couple of patches of bryopsis disappear. My pH is running lower both night and day now, however (had been using Reef Crystals, ph 8.05 night w/ kalk dosing, 8.18 day), down to 7.98 night, 8.06 day. Quite a bit more skimmate production, could be the "Bio-Actif" organic part is fueling bacteria and acid production. Too early to see differences in the coral I suppose. Also, have continued dosing vinegar in the kalk, and vodka though I've cut my vodka dose in half. But quite a bit more skimmate than I saw with the vodka/vinegar dosing before trying the new salt. Also, UPS managed to break the bottom of the salt bucket during shipping, even though PA boxed it up. PA promptly sent another bucket, so kudos to them.