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I moved your post to its own thread so it was not hijacking the OP of the other thread.
That would be good lighting for a 20 gal... but it is suspiciously cheap. I wonder if the fixture is UL rated? You don't want to save $30 and burn down your house in the process
That's an Odyssea fixture that I know has been panned by a couple of well versed planted/lighting members, so as fort said saving a couple bucks now may cost you more down the road IMO. I'd suggest you look at the lights here: fish need it;lights; food;Sponge