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I bought one of these: https://www.amazon.com/dp/B0B4HG7SKF?ref=ppx_yo2ov_dt_b_product_details&th=1 from Amazon to replace my previous 4 tube X 20-watt fluorescent mirrored canopy which hung right above my 20 gallon tank. It puts out an equal intensity of light while hanging 15 inches above the...