My wife really wanted a Betta, so I caved and we now have a 10g. The hood uses the old style T10 incandescent bulbs. In their place I put in two 14W 5000K CFLs simply because I had them laying around the house.
Let me tell you, that tank looks BRIGHT compared to my 20g that has a single 18" T8 8000K light.
I put some of my Brazilian Penneywort in floating, along with some Wisteria to hopefully provide some shade. Is 28W going to be way too bright? What's a good number for 'moderate' to 'moderate-bright' light?
I've been looking for those tubular CFLs but am having a really hard time. Lowe's had 10W 6500K ones, but are $9 each... seams really expensive. The 14W ones I'm using right now are the regular spiral kind you would use in table lamps. They literally just squeeze in, and touch the metal reflector, hopefully that won't become a problem.
I'm wondering if it would be worth buying two 10W GE Daylight spiral bulbs that would be a more correct 6500K. They are $11 for two. If 28W isn't too much though, I may stick with the 5000K and see how it goes.