Despite - or because of - the high stocking density there has been no appreciable friction. A partial water change of over 60% is however required weekly.
I started in 1980 by a 54 liter bowl. Eventually, I got times given 1Paar Melanochromis johannii who destroyed my "classic" fish. Soon there were young and a bigger pool was needed. So I worked my way through the years of 54 ltr., 100 ltr., 150 ltr to 300 ltr.