I would say a 240g for two Cichla that should last you for at least three years. If your planning on keeping them for life then a 350g and up would be best. Cichla love room to swim so the longer the tank the better. Also width of the tank is key they need plenty of room to turn. With experience and time interacting with your Cichla you will see what needs need to be meet to make them happy. Give them plenty of food while under 8'' feeders/krill/shrimp and any other food's they will take ie.. Pellets. Over filltration is a required must and lot's of oxygen especially at feeding time. I hope this helps.