I do know that some have changed due to having been kept in bad conditions, To be honest I wish they never did change they were much better before the strange colour change.
Hi Satomi,
It's only these two out of the entire group of siblings that have changed colour, I did consider it being due to the food prey but to be honest it's not happened before and hasn't happened since if it was due to a deficiency then surely it would go away once the deficiency was corrected and if it wasn't corrected then surely they would be experiencing it all the time plus I would expect it to be seen more often considering the sheer amount of ball's in peoples collections.
I have looked at all different ways and I don't claim it to be genetic if anything it's annoying because they were beautiful before hand and now the male just looks dirty.