Review on Reef Plus 2L/67.6 fl. oz.: Optimize Your Search by Esther Fisher

I use this and it's hard to say it actually does everything I can directly relate to this product. But my tank is healthy and all my corals are thriving. My only complaint about it is that upon arrival it looks like there is a layer of dark stuff on the underside. So I shook it very well, but now it contains normal liquid and some small black residue that doesn't mix back into the solution. It makes me think it's been on the shelf forever because it's not mixed well. I probably should have returned it, but I started using it before I realized how old it was. The 500ml bottle I used previously, the 2 liter bottle, mixed well. I think they should take it off the shelf and get a new batch.