This is another of my half-assed diy projects. I took a dish I had nails in, a under gravel filter tube, a air stone, and a small air pump I have had for I do not know for how many years, and made a skimmer. I made it as a proof of concept(I call it poc). I will be building a 5 foot version of this using pvc soon. It is just starting to skim pretty good after a day. I might even use it in a nano.