It depends on which type of 20 you're getting. 20 L or 20 H? The fuge ray definitely won't fit on either of them and if you get a 20H you may want to upgrade it to something a little more powerful to get light down to the bottom of the tank (otherwise I'd suggest finding a way to suspend it if you don't mind 2 inches on each side getting very very little light due to the length difference).
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