Lights off aggression

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tbrown7552

Plecostomus
MFK Member
May 25, 2015
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Floyds Knobs, Indiana
Two 5 year old Orinos that have been together since they were fry. They have been fine up until about a month ago. When the light is turned to moonlight or the light is turned off the larger one will start being aggressive to the smaller one within minutes. If you turn the lights back on it fizzles out.

It starts off with flaring and turns into backing her into corners, nipping, and hitting her in the side. It is continous harassment. The smaller one is getting pretty beat up. She used to provoke the larger one quite a bit. We think the smaller one is a female and the larger one is a female and she was wanting to spawn but the large one would always be passive and just take it for a bit then swim away.

Anyone seen some stuff like this?
 
All 6 of my kels hate each other one mn. and the next its one big happy school .
 
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