My girlfriends uncle just passed from cancer and his wife can no longer care for his 120g (4ft) african cichlid tank that hes had for years. It has i believe 7or8 haps and peacocks but not positive in it and we are going to take the tank. It has an fx6 and a couple. large sponges running for filtration. Question is can more fish be added or am is the tank full? I will attach a pic and maybe you guys can tell me what kind of fish you see.