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The single powerhead maybe fine for the cycle but 2 for cross flow is best.Helps with O2 exchange and algea control aswell as keeping debris and uneaten food from collecting.
As for outside , with so many things that could go wrong from temp fluckuations to forien opjects entering and seems it would be harder to keep in a controlled enviroment.
55gl sounds fine for beginner but pls preplan the whl tank from pumps to all the stock and things will go smoother.
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Lance H.
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