http://www.petsmart.com/product/inde...54842#prodTab1
I used this and I have had it in my refug for about 5 months and I really like it so far. I have 5 mangroves, and a litle razor calurpa, and some chaeto, I seeded it by using a little bit of rock rubble and mud from the bottom of an Lfs live rock tank. IMO it is the same stuff just takes a little longer to get there. Not sure about the Iron thing.
oh yeah soak SW for about 30 min in a bucket.