DIY
Well...I have a 10 gallon and I plan on building an acrylic, in-tank, skimmer/filter. The plans call for 10.5" square and 4" deep. It will take up a bit of room. I ordered 1/8" 12x12 sheets of acrylic from USPlastic.com for about $1.50 each. When I put it together (and make sure it works)...