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I Have No Fish but I Have Japanese Girls On My Ava
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18,487 Posts
I say for a 55 gal, an AC500.. but for your size Rhom in the 55 gal.. AC 400. The 300 will be ok for now, but when your Rhom does get bigger(which wont happen anytime soon), you will need to get a bigger filter. So, you might as well be in the neutral zone.
 

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Death is fair to everyone.
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5,310 Posts
I'd get the AC500. Say in a or two you want to get a bigger tank. For a few dollars more at big al's you are set.
 
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