Breeding Fahakas are relatively unknown in the hobby as they are thought to breed in deep water and Fahakas are known to be aggressive even towards conspecifics. Here is a link to a russian aquarist who has claimed to have bred Fahakas.
http://www.dmuratov.com/publications/breeding_nile_puffers/
http://www.dmuratov.com/publications/breeding_nile_puffers/