Which type of freshwater fish should not be with any others in the tank...just their own kind? I have heard that angel fish shouldn't be put into some aquariums but we always had angel fish and not all of them were evil, only the larger ones got aggressive. Does tank size matter for this type of thing as well?
Honestly any fish that isn’t of the same family or type. For example people love to put Angelfish and Neon Tetras, but in the wild the neons are food for the angels.
Similarly people mix in cichlids from different lakes or even add them in with more peaceful/community fish and wonder why fish keep disappearing sadly. A big one that is common is where people will put in a tank multiple bettas (it can be done for a sorority), but I’ve seen like a 5 gallon with 3 bettas which is far too few in a small space to work out nicely.
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Most obvious ones include bigger fish that are with smaller fish that can fit in their mouth since they will be food in a heart beat. Additional cichlids of different lakes or areas, or those of different temperament.