Hi Poppy and welcome to the forum!
It's correct that male tortoises often fight once they past a certain size. It varies between species.
The males of the sort I have always fight once they are more than a few years old and I separate them.
Tortoises often don't eat much if there is a big change so I wouldnt worry about that right now.
We love to see photos!
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Testudo Hermanni Hermanni (Corse) tortoises
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