Aside from being ugly, that crab has some NASTY looking claws. I decided long ago that anything with serrated claws is not welcome in my Reef. Too much possibility of it attacking the critters I WANT in my tank.
I think you will find that most people prefer IO to any other salt on the market. IO and Reef Crystals are made by the same company. I have been using Reef Crystals since starting my Reef a little over 1.5 years ago. Everything I've read on the Internet says that most reefers use IO and are...