Thank you very much for your reply and good advice. I shall look to either keep them separate or rehome the larger one and seek further guidance from the forum.
I have two Hermanns - one was a gift and is now 3 years 5 months old. The second Hermann is 2 years 9 months old and was bought by me because the first Hermann was lost in my garden for 52 days and I thought it would never reappear - but it did. The first photograph is of them both together, the...