To be honest I think you could just skim off surface water when you do your regular 10 percent (or whatever you normaly drain off) water change. I don't have any DIY pics or info on a suitable skimming device but would suggest either draining off water via your normal skimmer or if you don't have one use a bucket by simply lowering it into the water bottom first, until the top edge is just below the surface and pulls the surface water in. This works well and has a good suction action. Its also very inexpensive!
Alan.
Posted on Apr 25, 2007, 8:38 PM from IP address 213.120.101.21