I don't need them because I bought an AquaC Remora for my Nano which works way better. Secondly, it spits out way too many bubbles. I've only tried it out for 1 day but its clear that its not something that I would use directly in a nano tank. Its probably better suited for the compartments in a JBJ Cube where you can filter out the bubbles better.
The reviews are mixed. Some people like it, some people don't. I don't like it and I don't need it.
I like the Remora.
http://www.nano-reef.com/forums/inde...howtopic=67497
EDIT
*SOLD*