i had these guys years ago when i had a couple of mbuna set-up and these guys tried to hybridize with EVERYTHING-- even my heater and 2 plastic plants.
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i have eight of those in my community tank with two gold gouramis, eight honey sunset gouramis, four clown loaches and four corys. they dont really bother any of the other fish, they just go nose to nose with each other all the time. during the day they swim together and at night they all go under the rock stack i made for them.