i got a domino damsel, green chromis, false percula, and a firefish in my 20 gallon and they are alll doing fine and not fighting. 
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20gallon, yellow toadstool, 3 other toadstools, large star polyp, 4 green ricordea mushrooms, 8 headed frogspawn, fragged frogspawn, metalic brain, large finger leather, yellow devils hand, 2 dif kinds of zoozs, small xenia frag, leather tree,clown fish, firefish, domino damsel, green chromis 250W mettal halide, fluval 304, protien skimmer, and 1 powerhead,
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