i have four multis in a 60 litre, two very young ones and two older oe this is way too smal and they are bieng rehomed into a 110 litre tank soon as the stupid builders are gone ! lol
i think they should be kept in small groups in anything bigger than 100litres
they are nice fish and i used to keep two. one seemed dominant but when i introduced two more they seem very comunity friendly fish