Reddit reviews Zoo Med Ultra Sun Trichromatic Super Daylight 6500K Fluorescent Bulb T8 15 Watt, 18-Inch

Java ferns, java moss, and anubias are low light plants that don't require special substrate and prefer to grow anchored to submerged drift wood. Even without the wood, they'll grow in aquarium sand but just be sure not to bury the rhizome (the base of the plant that the leaves come out of). Other plants will be more demanding of nutrients in the substrate, but you can use things called root tabs to make it work. I would recommend using organic potting soil and "capping" it with sand, but that might be out of reach if your tank is already established.

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I'm not sure anything will grow with a 2W LED in a 20g tank. I'm using http://www.amazon.com/gp/product/B0002AQA8E/ref=oh_aui_detailpage_o01_s00?ie=UTF8&psc=1 for a ten gallon and it's working great for low to medium light plants, but you would be looking at something more powerful for a twenty gallon.

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Here is a guide that really helped me a lot as far as lighting goes.
http://www.sudeepmandal.com/hobbies/planted-aquarium/low-tech-planted-tank-guide/ You also may not need to use fertilizers with just a few low light plants.

I got one of these fixtures, comes with bulb but I got a 6500K

https://www.amazon.com/gp/product/B000HJ98PM/ref=ppx_yo_dt_b_asin_title_o04_s01?ie=UTF8&psc=1

https://www.amazon.com/gp/product/B0002AQA8E/ref=ppx_yo_dt_b_asin_title_o04_s01?ie=UTF8&psc=1

Finding T8s with the appropriate color temperature is getting harder. The last hold-out for those bulbs were aquarium shops, but in the last 2 years they've all migrated to T5 fixtures. I recycled two over-driven T8 fixtures because it was cheaper to just go to the new Feliz bulbs.

The only place you can buy the right T8 lights is on Amazon, and they're ~$12-15 per light With newer, more precise technology, it's no longer economically feasible to stick with T8s.

Here's another 6500K veg bulb

I bought this bulb, not sure of the details but it's allegedly a 6500k. Is this an ok one?

I don't use PayPal, unfortunately, but I see lovely stuff there! Thanks :)

Awesome idea! I looked around and found this http://www.amazon.com/Lights-America-7020GL-24-Inch-Undercabinet/dp/B008DGCKKG/ref=sr_1_9?ie=UTF8&qid=1394598697&sr=8-9&keywords=24watt+light+fixture Thing is I am not sure how to figuire out if the bulb would fit in there. I was looking at this http://www.amazon.com/Zoo-Med-Trichromatic-Daylight-Fluorescent/dp/B0002AQA8E/ref=sr_1_1?ie=UTF8&qid=1394598781&sr=8-1&keywords=6500k+light+bulb+24inch Do you think it would be compatible?