Care to provide more information on your tank? And how you introduced them into the tank? Also what you feed them.
Many reasons could have caused them to died.
Generally, they prefer slightly acidic waters. but most Rams are farm-bred, so they can tolerate neutral pH waters pretty well too. Temperature is not much an issue for farm-bred fishes.
I personnally have kept 2 pairs of Rams in a 2ft tank before. Squabbles do happen once in a while between the two females and two males. But nothing deadly.
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