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I had mine for maybe 6 months before it split, it was maybe 5-6" across. I had 2 for a few months then I gave one to a friend. His split a few weeks after I gave it to him and then mine split again. So now I have 2 that are 2" dia. There mouths took a month or so to reform before they would eat again. They are both getting bigger now that they are eating again. I am feeding them maybe twice a week now. My one clown is too big to fit into them so she has not been happy. I'm hoping they don't split again for a while.
I had a small rbta that split after I had it for less than a week. He almost split again immediately. He ended up splitting another 2 weeks later. After a month, he seems happy to be a triplet.