High Light. No Co2
My light broke a couple of months ago and I haven't been able to find a suitable light since. Instead I am using my 27watt, daylight lamp. It's over a 17 litre tank and if my maths is correct, thats around 7.2wpg. I only have Java Fern in the tank and its doing a lot better than what it does in my low light tank -- it's actually green, instead of black. I don't have Co2, but I dose a tiny amount of flourish now and again and I was just wondering whether I can get away without using Co2. I want to add Crypts and Anubia's, but the Anubia's under this lighting tend to turn a light green, but darken when I put them back under low light conditions. I also have a lot of Hygrophilia Polysperma in my low light tank -- 1.2wpg, that I want to add.
The wpg "guide" is next to useless when it comes to small tanks or very large tanks, and with the different types of light even more-so. For instance, I have 72 "watts" over my 5-foot 115g tank, and 20w over my 10g. But the former is T8 fluorescent tube, the latter is compact fluorescent incandescent. The same plant species grow identically in either tank. This is like comparing apples to oranges, i.e., = unreliable.
What sort of bulb is it--normal incandescent, compact fluorescent screw-in, ...? If the plants are growing well, and algae is not increasing, there would seem to be a balance. I certainly wouldn't mess with CO2 in that small of a tank.
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