what size are the fish?
they can be sexed reliably 6" up
head proportion bigger for males
body will be more longish and overall males are bigger
females look more compact
and for RD, breeding tube (milt tube for males, ovi tube for female) for male esp can be seen 4" up.
it is pretty obvious.
compatability questions are the hardest to answer.
the best reply is trial and error, and understanding of cichlid body language....
not much of an answer but eventually will have to experience yourself.
very rough guideline will be central american cichlids more to the aggressive side, eg trimac, midas.
if you are trying to mix fish like jaguar, oscars with them, have to be at least 30% bigger to be safe.
size for size, there arent really a lot of fish that can match RD. you have to give other fish size advantage
for the rest, it is where the trial and error part comes in. Who knows you may get a RD wimp..
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