I would keep the single gene male clown because he will be able to breed in probably less than a year. There have been anecdotal reports of male balls breeding at early ages and surprisingly lower weights. Some that may not necessarily being seen to be producing sperm plugs. Most have gone on to successfully sire clutches. Any clown is a worthy keeper to me. Consider putting him( once he has a reasonable weight and size) to all your intended females. I’m actively putting my 10 month old red stripe yellow belly 66% Het clown male to a unproven first time coral glow female possible Het clown. There have been a couple of locks over the past weeks.