how red is red? Pups have a natural pink to them, you may be looking for things that are not there. We have all done it when new to rays.
I have heard mixed reviews on tahitian moon being ray and geo safe I keep both in my tank with it without any issues. But I will be using different sand for my new tank just to be safe.
Either way pictures would speak 1,000 words. I would hate to see you switch out the sand if you don't need to you may start the process of the ray getting used to the tank all over by stressing/switching the substrate around.
I have heard mixed reviews on tahitian moon being ray and geo safe I keep both in my tank with it without any issues. But I will be using different sand for my new tank just to be safe.
Either way pictures would speak 1,000 words. I would hate to see you switch out the sand if you don't need to you may start the process of the ray getting used to the tank all over by stressing/switching the substrate around.



