Anyone try these?

[Socalx45]

I went to my LFS to buy some more live rock for my refugium and the they recommended these cubes for the refugium. They had brand new frag tanks cycling and the sump for these tanks were filled with them. So I bought 15 for $25 to try them out. Has anyone else had success with these?

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[texdoc77]

Looks like marine pure, a ceramic based substrate for the growth of bacteria. Marine Pure works great.

 

[darmar7812]

Iv heard great things about them but haven't tried them yet. Heard they have a immense amount of space for bacteria