I use this beauty on my 10 gallon and it's insane. Like every other Kessil flashlight, it gives off a beautiful "glow" in the water that I haven't seen from any other company. It also grows insanely fast - my Xingu swords have doubled in size in a short two week period. The purchase price is a bit high, especially since you NEED a gooseneck, but it's a good investment. You will love the results this product can deliver the moment you turn it on for the first time. I've read of penetrance issues in other (probably larger) tanks, but I can assure you that if your tank height is under 14 inches, you won't have any issues at all.
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