you said :Aggression. Your old fish defend their tank by attacking the newcomer.
i cheaked this chart and it said those fish are community and are not aggresive fish.
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20 gallon
2 dwarf gourmis
2 sissortale rasboras
5 giant danios
1 chinese algie eater
1 pinapple swordtale
1 orange female molly
3 red wag platies
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