yeah, the 20 gallon is probably a little small, and my dad had a 38 gal with a gourami in it, and it was aggresive, but it was a male. The loach should be fine though
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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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