Neon Dwarf Rainbowfish Is A Bully

Voldy

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HI I'm new here. Desperate need of help.
-I have 20 gallon long tank
-cycling for 1year
-lightly planted at left side of tank and medium sized driftwood at the right
-flourite black substrate, aquaclear 50 filter

I have a lone male neon dwarf rainbowfish - have him for 10months now (other of its kind died through time until he's the only one left). I'm suppose to buy 6more (2m:4f) but my lfs don't have them in stock.
so I bought 11 cardinal tetras instead. I rearranged my tank when I introduced them and kept lights off. I've seen my rainbowfish attacking them and already 3 died, 1 each morning.
I separated him to another tank overnight but still attacking cardinals when put back to main tank.
Does buying more rainbowfish will help the aggression? Thanks!
 
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Voldy

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added info:
when the rainbowfish was in a separate tank overnight; there were no casualties was seen the next morning.
 

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