yeah i would take out the jacks and not add anything because there wont really be a "gap" to fill by their absence, the tank will still be overstocked, also you have to have either 1 pictus or 3, 2 will fight. and you want all the cichlids to be males or they may pair up and cause problems for you (though O gender doesnt really matter since they dont really interbreed with anything) Os are extremely messy fish and by having one you are seriously limiting what else you can put in the tank due to their bioload. and with that stock you will definitely have to do water changes AT LEAST once a week, every other week would definitely be too few and your bioload would be too high for that when they are all grown
