Cardinals

I have a 20G, and i currently have 2 Occ. clowns, a firefish, and a PJ cardinal. The tank has been doing great, but I really want to get either another PJ cardinal, or a bangaii. What is your opinion on having that many fish in a 20 gallon? Thanks, andrew
 
Well, i can always just upgrade to a 30g, I have the stand and tank and it isn't a big deal for me to do that, then i would be able to add a couple more fish eventually right?
 
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