sump refug for a 20gal long? ideas?

[Reefpete]

I have a 20 Gallon long that I want to eventually have a sump on and was wondering if i can use like a 10 gallon for a sump refugium

 

[alex07]

Yes you can, there's a lot of DIY on youtube and google. I just converted an aquaclear110 into a fuge, just giving it a couple of days for the paint to dry very well on the filter

 

[Reefpete]

what do you mean by paint?