“I got the tank from/set up the tank with instructions from a guy who’s been breeding cichlids for (x-number of) years.”

Did you? Well, that must be why it’s such a smashing success. You’ve already had one killed and another is in a hospital tank because it got beat up, and yet you still don’t grab a clue. The difference between a 20H and a 20L is six entire inches…and precisely what part of “too fucking small” did you not understand?