Nice heavy frag disks By Gob on 1/11/2014
Gob would recommend this product to a friend
I really like these frags disks. They are fairly large and are heavy enough to keep from flipping over or getting pushed around too easily. I like that they are ceramic instead of the aragonite and cement type that could potentially leach harmful substances into the tank. They also don't deteriorate over time like the aragonite with cement ones.