Depending on your bioload, I don't think the S will be sufficient. From a GEX product guide I found online, they recommend the use of the L for 2 ft tanks.
Note that some of the members here have had noise problems with their GEX HOFs though. So the decision is entirely up to you.









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Don't really like to stockpile too. Haha
Placed filter behind the tank with water level higher than the filter. Seems to be running well so far.

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