The Eheim 2215 would put you at 8x the turn over rate for a 20, and $20 more then a 2213. for $25 more then the 2215 is the 2217 at 13x turn over rate which is a bit overkill on a 20L lol.
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1x 180g - 1x 75g - 1x 65g - 4x 55g - 1x 29g - 1x 20g - 1x 15g
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