Join Date: Sep 2003
Location: San Francisco, CA
I can't say whether or not that would make a good planted tank as I've never used one before.
I can answer your question about substrate with an UG filter, however. FloraBase, a plant substrate, was designed for use with UG filters. While I'm not a huge fan of the stuff when compared to Aqua Soil, it's decent for what it does. You might want to look into that.
As for the UG filter in general. Most people don't like them as over time, the plants' roots tend to clog the intakes. This is indeed a potential problem except for the fact that a large majority of nano tankers rarely keep their nanos up for more than a year before tiring of a certain look and tearing down to start over. So if you were to plant mainly around the edge of the tank, you'd be fine. (Or just plant mosses, ferns, and Anubias plants that don't throw roots into the substrate.)
The light on that is weak given the distance it needs to travel to the substrate. This will limit what you can successfully grow. A light retrofit may be in order if you want to have access to more of the plants this hobby has to offer.