Sorry I didnt offer more educated advice, I only replied becouse I found disco kitty eye catching.
In truth I was not even familiar with the term Payara untill i just did a search. It brought up an angling site picturing a 50lb fish with 3.5" long teeth looking capable of taking a mans head off Kitty beware
So my rather uneducated advice would be that they and the ray might need a bigger tank or rift lake in the future.
the others have my prayers
Is Payara a generic term for a greater body of species?