IMO they will kill each other off till the strongest most dominant fish is left I've had multiple aros mixed together and at one time I had a 22 inch jardini two 18 inch silvers and a 20 inch black and I ended up getting a really good deal on a 13 inch jardini ($65) and tried adding him to the tank it worked for about three days and then the jardinis started fighting and I had to take the small one out so in my experience I'd say they'd kill each other till one is left
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