Hey there, SoBe_fish! Welcome on board! For future reference, you probably will want to start a new thread with a question like this. If you go into a particular section of the forum, right about all the threads you will find a "new topic" button. Press that and BAM! Away you go!
But to your question, usually fish won't grow because of infrequent water changes and/or insufficient nutrition. Both real bummers for the fish! Of course a 20 gallon isn't big enough for such a fish long-term, but it should still grow. How often are you changing the water in there? Nobody likes to swim in their own poop, man! Also, how big is your little guy and what are you feeding?
As to sex, I can't help you. That kinda came out wrong, but you know what I mean...Sorry, chum!
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SPOOOOOOOOOOOOON!!!!!!!
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