male peppermint pleco's can be aggressive at times. It is a shame really as they can be lovely creatures when passive.

though I have found they can get very territorial as they get bigger and more mature.

I have been quite lucky with my 4 males, as yet they have yet to show any signs of severe aggression apart from a little flaring at each other over food.

sorry to hear of your loss, hope you find a male soon.

sometimes males or fish just prefer the solitude of a female or two or a tank of there own, you may need to keep a closer eye on that male as
it develops

kind regards

Lj

think it all just came down to "nice cave you got there, its mine now" and the weaker fish lucked out in the end. lesson learnt so all i have to do now is find me a new male...