I never bothered to replace the bulb that came with my tank. It was a really shallow tank, and even though the bulb was pretty much blue my (uncomplicated) plants were doing really well. They were growing slowly.. Which is fine by me. I want this tank to be very low maintenance without being strictly lowlight. Anyways... I was in walmart and decided to finally switch over my one bulb to something in the 6,500 K range. I want my plants to grow a tad bit faster. Mind you this is my first planted tank, so I wasn't prepared at all for what this bulb looked like. I'm very used to the soft white blue colour. BOY this thing is YELLOW!!! My whole tank is a bright yellow green. I know I just put it in, but sheesh.. Is there anything I can do to offset this colour? I don't have room for any other bulbs.. I was going to get a new T5NO fixture with two bulbs... But I figured it was going to be waaay too much light. And I want to avoid carbon and the like. I just dont know.. Maybe a single strip of LED's? What colour would help offset it?