Schmike finally managed to comm them. 
I keep my Piggy & Shelly together in the same tank too with no issues and they didn't even grow up together. Shelly was much smaller than Piggy when I got her and when I introduced her to him, he did try to bully her initially but after 2 weeks looking at each other behind a divider, they got along fine after that.
She's already his size now and on a diet because she is obese -_-"

I keep my Piggy & Shelly together in the same tank too with no issues and they didn't even grow up together. Shelly was much smaller than Piggy when I got her and when I introduced her to him, he did try to bully her initially but after 2 weeks looking at each other behind a divider, they got along fine after that.
She's already his size now and on a diet because she is obese -_-"