I used and tested every single product form the Seachem line when it came out 7 months ago, and have been selling it since. The full product line works fantastic, and I can not say enough about the 'balance' product. Everything works with great success for small or low stocked tanks, you'll have to upgrade to something stronger from Seachem once you have a very well stocked system. But I have seen many client's systems flourishing with this product! Much better than competitors! (Note: for mega stocked reefs or ones sucking this out of the system, i.e. adding more than once a week, is rare! At that point move up in the Seachem Line or other high concentrated product like ELOS!)