So I'm a poor college student, and because of that, I buy my aquarium piece by piece. Recently I ran into a Coralife light fixture for $20. It holds two 96 watt double-tube fluorescent, and even had a deep blue, working, tube installed!
They thought it was 1/2 dead, so it was in their pile of used junk. Replaced a fuse and some wires on a fan (it was overheating) and it was good to go! I threw that bad boy up on my tank and watched the plants GROW, inches a day!
For the first 2 days. Then they stopped. And started getting spotty dark green, and finally brown creeping along the edges of leaves. I figured this was CO2 depletion, so I turned the lights off to stop photosynthesis.
I have a few questions about my new miniature sun. Right now, I have a blue light and a 10k white in it. Does the color matter for plants? Would it hurt to run the blue light at night?
Finally, what kind of CO2 do I need for a 40b aquarium with a high output light, and how can I get that as cheaply as possible?