Senegals will max out at around 10-12 inches, and they are just being grown out in the 29 as they are only about 4 inches right now. The sun cat is not the same you are talking about, this one should get around 8 inches. I am moving the big guys to a 90 this summer. The convicts don't bother anyone except each other. BTW, the tank has been up and running for about 3 years, never a problem.