Thank you everybody for the reply. Currently I am using 2x10W CFL full spectrum Lights of America(bought from Walmart) bulbs on my 10 gal shrimp tank. They don't specify the colour temperature for these bulbs but they say are full spectrum. These bulbs works pretty good for the low light plants that I keep in this aquarium and I didn't have any major algae issues. I would like to start a new 10 gal set-up with more light, that's why I purchased these bulbs. Maybe 2x18W for that tank is too much, I will probably use one 18W and one 10W bulb. Daniel _______________________________________________ GSAS-Member mailing list GSAS-Member@thekrib.com http://lists.thekrib.com/mailman/listinfo/gsas-member