When one do you guys prefer tropic marin reef pro or bio-actif
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This is not quite correct. The Bio-Actif is Reef-Pro with their Reef Actif poweder already mixed in. Reef Actif is essentially a very mild carbon dosing product made from seaweed ... and can be used regardless of how much or little PO4 you have in your system.The Bio Actif salt is specifically designed for ULNS (ultra low nutrient systems). You most likely want to go with the Pro Reef...