It has nothing to do with being "hellbent" on more cichlids. Let's break this down a bit, shall we? Phterophyllum scalare (angelfish)-6" (and top-mid level swimmer) Thorichthys meeki (firemouth)-6" Pelvicachromis pulcher (Kribensis)-3" depending on sex Mikrogeophagus ramirezi (blue ram, didn't specify so I'll assume)-2" After that, the betta are rather small, neons and lemons are all about an inch, and most cory species stay under 2. This means a light bioload. A mbuna tank in a 55 GALLON is generally stocked 10-12 mbuna around the 6" mark. So enlighten me on how this tank is already jammed full because I'm not seeing it. Is it well stocked? Yes. Can it accommodate another pair of cichlids, like maronii? Easily. Keep up on your weekly water changes and it will be no problem.