Separate them? Tbh dats are hit or miss when it comes to aggression, I find it odd your 4" dat is bullying a 9" aro? But then again I had a 6" dat smash a 9" Oscar around like a chew toy. They can sure surprise you.
Sounds like a mean dat. If you can't separate them then try getting some dither fish, like silver dollars. Just any large hardy peaceful fish that will help spread the dats aggression
Sounds like a mean dat. If you can't separate them then try getting some dither fish, like silver dollars. Just any large hardy peaceful fish that will help spread the dats aggression
With my old dat I actually had to use a semi-aggressive fish (an oscar to be exact) to break off the dat's aggression toward the other fish. When I just tried using silver dollars, he beat the hell out of them too. Only when I added the oscar did the aggression towards the other fish stop.
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Actually, they both kinda kept each other in check. I had separated the dat from the main tank, then bought the oscar. Without the dat the oscar was harassing my loaches. Once I put the dat back in they both left everyone else alone. A little flaring at each other but that was it.
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