Has anyone used this?

[marty]

<a href="http://www.cprusa.com/products/citr.html" target="_blank">http://www.cprusa.com/products/citr.html</a>
CPR AquaFuge H-O tank Refugiums?
Thanks!

 

[marty]

Anyone else with experience/research?
Also, they come in 12", 18" or 24" long. Is longer the better? How much live sand should go in there?
Thanks!