Very good thoughts. I don't control pH as well. I believe the low pH in my tank is due to one WC a week and only 25-30 percent. I have so much fish sh*&t in the tank that one might think that was my substrate. Operating in such a low pH is very dangerous because without proper buffering a pH crash can kill the bio filter.
Like the Boeing 787 Dreamliner with composite fuselage, I like to think outside the box in filtration. I think the ease of tank cleaning will stress the cichla less which keeps them fat, dumb and happy. A filter is a filter. They all do one thing but they vary in maintenance. Controlling filter cleaning whether often or not I believe is key. But keep in mind this does not mean you can do less WC. It just mean you can control when and how much as needed with ease.
Interesting thing is I only feed once a day (pellet only) and sometimes skipping a day. So I'm thinking growth is not totally related to feeding.
Well, these guys are still in the 55g. So growth is not totally related to tank size.
Perhaps water quality or stress free environment?
Beauty and the beast.