I.d this fish?

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I see alot of 'brissle nose catfish' and 'plecos' in the classifieds here, what's the difference? I know one gets really big but what about the others?
 
Well, they are different color, look a bit different, and the size, it ranges from the common pleco, which grows 2 feet, to the sailfin pleco1.5 feet, to the rhino pleco, 1 foot, to the rio negro pleco, 5 inches, to the clown pleco, 4 inches
 
So none are suitable haha! I guess I'll go with the ottos (granted i can find them) how many would be okay in 9 gallons?
 
Thanks for all the help :)

I'm going to add my driftwoods tonight, so excited!
 
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