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You can probably get by with a Bristlenose Pleco, they get between 4 and 5 inches, do a good job on algae and love veggies.
As for how many fish a general rule is 1" of fish per gallon but use adult size to calculate.
I rule out the other cat even though it is below the 14" general limit because of the physical size of your tank. A fish that big, although your bio-load may handle it, will not have enough room to even turn around.
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