some say the LB can tolerate the temp but i have never kept them together so i cna not give you a 100 percent answer....this is a topic that pops up every now and then in this forum.. do a search and you will find a few threads on this topic that you can read
i tried it but my lm ended up getting to large and ate my two peacocks, who by the way were bigger when i started the tank. but it did last for 8 months. and boy was it fun to watch them eat.
hmm its hard to belive that a large mouth bass out grew your cichla.. i have owned largemouths in the past and no way do they grow faster... maybe lack of high temp and alot of water changes...