I'm new here but I have had a rather successful 5.5 gallon planted tank for a while (over two years, I think). It's lighted by a 14 watt NO plant bulb, and contains crypts, sags, duckweed and javas... The plants even pearl once in a while. There are currently two killies in there, and a small powerhead to provide movement. No filter. Fluorite substrate. And lots of pruning that I've been putting off. :P
My issue is, I've been reading on this board that my tank is underpowered when it comes to light! Apparently, my 2.5 wpg isn't considered enough... and that I should aim for 5wpg or even higher. WHY does the rules of wpg break down when it comes to smaller tanks? HOW? According to this rule, my plants should be languishing, but they're clearly not.
I'm starting another 5.5g tank in my bedroom... This time it has a 13w CF bulb in the fixture. According to this board again, a PC bulb is twice as efficient as a NO bulb... Thus, I actually have 26 watts over my tank... which brings the lighting to 4.72wpg. Is this right??? Again I'm going with no filter and a powerhead for water movement, along with a Fluorite substrate. Not sure what I'm going to plant, tho. But if I have almost 5wpg in there, does that mean I have to fertilize and add CO2?