Not in a tank that small, you might get away with a well stocked 300g where they can't focus on each other. The tank would have to be bare so they couldn't establish a marked territory.
Why? Every situation is different, you should be going on recommendations that pertain to the norm, not the exception.
I myself have two seperate tanks that have RD and Midas combinations. Plus another tank with 6 RDs in it. What does this mean for you? Nothing. You have now experienced what many people did tell you was likely to happen.