I wouldn't be so quick to cross a Lima off, there are two species but only one comes in for the most part, some very lucky people have gotten the larger rarer true Lima. The other, smaller, more common, species is elongatus which only gets to a 1' I've only ever seen one this size, and it is still not girthy I think your Senegal would be fine, especially seeing as how you'll have to get a smaller specimen to grow up with the senegal, but if you are one of the rare cases and get a true lima well, what you do with it is up to you. And as others have said, cichlids can be a hit or miss for different reasons, whether they're to greedy or aggressive.