Deepending on our MH / actinic blend it may not make sense to run your actinics while the MH's are fired up as they may not contribute an appreciable ammount to the illumination of the tank. For example 400 w metal halide & NO flourescent actinics. If you are using the actinics for color correction during the day then you need to leave them on otherwise yes, it will look yellow. some 14 & 20k halides don't need the supplementation & actinics are only used for dawn / dusk.
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