This is a HOG.5 scrubber® that is newly installed; it is one LED, and a small Green Grabber® algae attachment area. Since it is shown here on a large sump, is can only be used to grow fresh food for feeding; it is too small for filtering this system. Keeping the top slightly above the waterline makes it more quiet and keeps most of the spray inside. There should also be a black shade cloth over half the light until some color of growth develops.
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