Oddball;1136982; said:The mbu is a massive waste generator with a prediliction for regurgitating meals. This will cause some problems with maintenance for the pristine water rays demand. Not to mention that the mbu prefers hard water with the pH on the alkaline side while your rays prefer soft water on the acidic side.
I'd rethink the setup so these specimens have a better chance of making it to the show-stoppers they have the potential of becoming.