Refugium and carbon

[blacknife]

there are some on the market, I have one sitting here collecting dust now that i have a sump.

there are other brands out there but this is like the one i have<mine is older>

http://www.salinesolutions.net/refugium.html

if your good with acrylic it might work as a diy project.

it worked fairly well for me when i did have a sump-less