I have a Fluval Evo 13.5 gal AIO. The light that came with it isn't super bright, but I have all softies and others say it should be fine for them. I thought I would upgrade the light and bought the Fluval Marine Spectrum 3.0 because it fits perfectly into the hood, which I would like to keep. It does not appear to be any brighter than the included light and so the main difference is that beyond the standard settings for whites and blues, you can also adjust the color mix yourself, but they don't provide any guidance for doing that. It's up to you to figure it out. I imagine they set the included AIO light with a good light mix already, so is it really worth keeping the new one if it doesn't seem any brighter to the eye?