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How tall is your tank? And do you have glass covers? I suspect you need 60+watts of LED lights for a tank that big. You can try adding good-looking LED floodlights. You can target a section of the tank and not have the whole tank fully lighted.
 

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I’m not sure. It would be helpful if the light listed their PAR data. That’s how Bright it is. Some of them do list the PAR. Ideally, the PAR to your substrate should be 50-70 for something like baby tears. You can borrow a PAR meter to measure how much light you have.
 
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