I think you'll have much better success with three lei over three jar as there much less aggressive towards tankmates and will accept same species fish , jardini will accept other jars but its rare and usually ends in death or constant fighting
I have 2 jar 2lei and 1 silver around 6-7" now..a little nip here and there over territory but nothing serious. As long as kept it well fed. All 5 are being sale as we speak. message me if you want them.