Yea it's "great stuff" with a lot of coco fiber and moss silicone to it...do you think the plants on the edges of the tank will get enough light with this fixture?
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If you're worried about how much light the plants are getting, I recommend getting a light meter. The light meter will tell you how intense the light is in the tank. It will also let you know when the light itself begins to produce less light and needs to be changed.
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