Silver Shark

[fotoman]

I have two Silver Sharks; they were both the same size when I bought them in May. Now one is much bigger than the other and seems a bit greedy. I know it's difficult to sex these and I wouldn't have a clue where to start, but could that be the answer?

Many thanks

Dave

 

[Matty]

could be genes, could be sex and are you asking how to breed them?