I've been trying to read through you older posts and it seems that in your opinion a T8 is enough for a 12" deep tank with low light plants. I guess my question to you is, are the marineland T8 fixtures ok, and would you recommend 1 or 2 of them for a 20 long 30"x12"x12". I would also love to get your opinon on bulb choices, I listed several of them in the thread. Thanks in advance if you find the time to help.
When I quit using a drop checker I was using 1.7 dKH standard solution instead of 4 dKH. That would be yellow at around 30 ppm of CO2. When I was doing that I was using DIY CO2, as I am now, and with that you don't need to get too concerned about having too much CO2, but I liked being able to see that I had a significant amount, using 1.7 dKH. All of this was over a year ago, and my memory isn't good enough now to remember all of the details.
You can light a standard 55 gallon tank with one T5HO bulb, in a good quality light, for example http://www.catalinaaquarium.com/stor...oducts_id=1837 This should give you medium to high medium light with it sitting on top of the tank. Using the feet it can be purchased with it should give low medium to medium light.
LED lights have some advantages, but cost a lot more than T5HO. The Marineland Double Bright, 48-60 inch light should give you good low light. Or, you can DIY a custom light to get whatever intensity you want, with a dimmer so you can adjust the brightness. That is the best light for functionality, but can be pretty expensive too, perhaps $200-$300, and you first need to learn how to design and build it.