You hit the nail on the head right there. Can you switch rocks out with one from a different tank?
I’ve had dino in 3 tanks and no bottle anything cured it, neither did removing the sand bed or taking rocks out and scrubbing them. I tried it all. Balancing the system and allowing it to mature was the only way I got dino to die back, cause it’s impossible to “cure”
No, this is my only tank. But I'm optimistic.