I recently purchased an Eshopp's PSK-75H HOB
skimmer, but it only skims from the water column. With the addition of the skimmer to the back of my tank, the HOB
filter, which had kept the oily film in check, had to be removed.
I decided to make a surface skimmer box for the PSK. I bought 2 8x10 inch sheets of Lexan from Lowes (about $8), and cut them into 4 pieces. Two pieces were 3.5x8 inches, and two others were 2x8 inches. I notched the top to allow overflow, and used a spare tube of Marineland sealant to bond all the parts.
I'll post pix later tonight when I get home, and will have it in the tank at some point tomorrow.
Note: GE has modified the formula for their "classic" Silicone I product, and it is no longer aquarium safe, even though it states it is 100% silicone. It doesn't appear that any major manufacturer (GE, Dap, & Loctite are the ones I looked at in Lowes and Home Depot) of ordinary caulking/adhesive makes an aquarium safe product. They might be waterproof, but they all carry warnings not to use them in aquariums.