i dont think that there is too much light- i have a 4 Litre tank that has a homemade fixture housing a 13 watt screw in compact fluorescent bulb. i have found this to be absolutely perfect for growing hemianthus micranthemoides, as the plat grows radily, nightly releasing streams of bubbles. i get a very small amount of green spot algae but nothing significant. there is no carbon suplementation in this tank, but i would be keen to try excel. |