Weird!
Well, what are his tankmates ? I keep them, too, and yes, they are aggressive, but as long as you know what to expect, and know how to tweak tankmates around, they're fine.
Bigger than him;
pink Oscar, mangaunese, white red devil, flowerhorn, rhino pleco, and a RD x Thai silk.
Smaller than him;
Razor back musk turtle, IT datnoid, Smaller pleco and a jack Dempsey.
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