- Jan 27, 2011
hey guys, i just put a 420nm 24" actinic bulb on my tank. it only 17 watts. i heard the an octopus sees better in the blue spectrum of light, but im hoping this will be ok....the main reason why im using this light is it looks BA! and I also heard that this type will assist with growing coraline algae faster. lemme know if this is ok or if I should go with the 50/50 light. basically the light that came with the ballast is a standard light and my coralline algae is bleaching a little.