I have a yellow tail, a yellow belly, a bi-color,a four stripe, and a blue devil in my 135.They all get along well.There is the odd dispute,but no blood shed.I love damsels.Pretty,tough,and cheap.
I have had some in the past that were real a-holes though. It is hit and miss.Just like everything else in the hobby.
I say if you like them,then get them.
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Tony
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