Bryan from Finnex responded:
Thank you for your Finnex Pico Aquarium purchase.
Opinions vary, some strongly believe 6500k is the best for plants. Others claim 10,000k. Many contributing factors are also involved. I believe it is all up to the individual and their current live stock. Many users of our bulbs do very well with their set ups as you can view on different forums.
Our Energy Saving bulbs are not offered in 6500k but I believe marine depot carries one that will fit our unit. But to be honest, we have received no complaints with growth (both plants and corals) and I recommend you use the stock bulb. I'm sure you will be pleased.
So with this information and your success, Tony. I decided to just use the stock bulb that came with the Finnex 4gal.
Today, I also decided to do silent cycle, bought a lot of stem plants, setup my CO2, and just went for it. No scaping here, just trying to do a silent cycle for now. To see, click on tank view under my UserName - you will also find closeup of Bacopa monnier, which seams to like the setup.
So far, all looks well. If these bulbs can silent cycle, this will be even greater proof.
Last edited by Tphillips; 09-04-2010 at 08:04 AM.