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I still wouldn't house two together, even in a big tank, if you are inexperienced. They might do just fine - for a while - but they can turn on each other anytime, and if one is bigger, there will be bullying. Even if they are the same size, they can be fine one day, and fight to the death the next. It's just not worth the risk to me. That's a great size tank, and they would love it. And it can still be ideal if you put a divider in it!