with a 20 gallon, i would go with some bloodfin tetra, they are just so cool, i have one, i need to get him some friends. you cant really get predatory fish for a 20 gallon, unless u get a smaller cichlid.
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My Tank
38 Gallon: Tiger Barb x5
Serpae Tetra x6
Blue Gourami x1
Bloodfin Tetra x2
Gold Barb x1
10 Gallon: Gold Gourami x1
10 Gallon: 5 Shiners (Wild)
   
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