Yes and No. My rtc ate the my lima since the rtc grew faster. I have a 22" rtc he has eaten everything oscars, plecos, everything. His growth rate was faster than all of his tankmates. If you want to mix a lima with a rtc. get a big lima and a very small rtc. at some point the rtc will surpass the lima and then eventually eat him, but at least you'll get to have both for about six months ish!!! I have a 5" rtc, 2 6" rtc/tsn, and a 6" tsn in the grow out tank, they grew to that size from less than 3" in a month. Yes I am power feeding them. Tilapia YUM!!!
When you have a rtc be prepared to lose fish even those you don't you'll lose...