Space in the filter box, I'm running my 24/730 gallon tank, when the light hit here it was quite green, water was circulating but turned green as plants/decorations from the smaller tank it replaced , were transferred. The fish were in the tank, the plants were in the tank, the light doesn't affect anything, it doesn't fall directly on anything, so only the water flowing through the filter box is affected. It took a week but the water is absolutely crystal clear and has been for a month. Would highly recommend this little lamp, easy to use and at the right price.
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