75 is not small akuarium. If you can't successfully keep a pair of 20 cm cichlids in it, or 3 females then you are not a very good aquarist and you are doing something wrong...That's because most questions asked is trying to cram fish in too small of an aquarium for long term survival and health. Many of the folks don't have the long term experience in keeping the fish (3-4 years is not considered long term).
If people post up front they don't care about long term keeping or tattered fins from territoriality, then comments about aquarium size generally don't show up.
On YouTube channels, where people keep 50 species of cichlids, they do not exaggerate when recommending such volumes. Now I'm building a 120 gallon tank and someone comes and tells me you can't put just a one pair of Midas cichlids in there. If they're going to be better off in a 250 gallon, with a couple Oscars, Vieja and Texas cochlids, then great, then I'm definitely wrong!