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A 50/50 bulb is an actinic bulb/10000k bulb. These are used in marine setups & are better for coral growth. The actinic bulb does little for plant growth. It would be better to replace the bulb with a 6500k/6700k bulb. If you look around you should be able to find the freshwater version of that fixture.
 

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Premium Member
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In that case just replace the bulb. You could ask before you order to see if the company is willing to switch out the bulb.
 
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