Planted Tank Guru
Join Date: Jun 2004
Location: Baton Rouge, LA
The plants you choose really determines everything.
I have a stock Eclipse 3, with gravel substrate, and it's packed with wisteria and hornwort. No algae, no ferts, and no maintenance other than a 50% conditioned tap water change every week or two. The plants rengb6 suggested would also do well in this tank.
If you want plants that require more light, things get more complicated because as light increases, you reach a point where CO2 and ferts are necessary to keep the plants healthy and algae away.
For lighting upgrades, plain old $4 PC bulbs work just fine as long as they provide enough light for the plants you choose. I prefer the "Daylight" variety (6500K) because the more common "Warm White" looks way too yellow in a planted tank to me.
Biowheels lose CO2, so remove it if you supplement CO2. In a filter this small this reduces biofiltration quite a bit, but the plants will also act as a biofilter as long as they're plentiful and healthy.
Plain gravel is fine for many plants, but plants that are heavy root feeders or that spread through the substrate will do much better in a more advanced media. Which substrate tends to be a personal choice, as they all have their quirks. I personally use Soilmaster Select in my high-tech tank.