Hi
A breeder I know found out among several Synodontis multipunctatus that were held in the mouth of a , I believe it was, female Copadichromis azureus, a single Synodontis petricola.
I was told that S. petricola are comercially bred without the presence of a foster mother... Aparently they are also cuckoos like S. multipunctatus. At leat ocasionally like ocasionally S. multipunctatus prefer to breed without any cichlid female taking their eggs.
