Go Big Or Go Home !
Here's what I used for my 30g
Amazon.com: Finnex External Refugium/Breeder Hang-On Box/Air Pump and Air Tubes, 1-Gallon: Pet Supplies
It's a simple 1gallon HOB and it caused my nitrates, which were always above 50, to drop to constantly around 5 or lower. Just get this and a light for it be under $50 bucks
O wow that's one heck of a deal looks great and doesn't cost an arm and leg like the others out there.
Might have to pick this up when I do my Sea Horse tank.