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I had a kuhlii loach. He was a hardy little guy with personality, and a decent bottom cleaner.
Our last 20gal tank had sharks and barbs. They're all a little aggressive, and we did have some trouble with the sharks when we had two. Aquarium store guy said you should always have them in odd numbers so we got a third.
I really liked watching the barbs. Tetras are more peaceful, but aggressive fish were more fun to watch, even if it sometimes meant replacing a fish or two.
The fish store should have good advice on how to properly prepare your tank and add fish. We bought our equipment as a bundle and it came with a beginner's aquarium keeping booklet published by the store that was full of good advice.
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