Originally Posted by NEreef
they won't know the difference between itself and the other, so they won't sting. actually torch, hammer, frogspawn can all touch for this reason.
There are many exceptions to this ‘rule’. It is often said that all Euphyllia species can be placed together – and they sometimes can – but I’ve had a torch coral kill a hammer coral and a frogspawn in a matter of seconds. There are many other accounts of this, as well. I will say that you do have a much better chance of success with two of the same species, but it is my understanding that torch coral toxicity can vary based on its site of origin – and if one is significantly stronger than the other, it will be bad news for the underdog.