I would soak the primeagra in a cup of bleach to a gallon of water like Ray says to on his site. This past spring I repotted a phal in primeagra and noticed about a month later that it's roots were rotting. My mistake I believe is that I repotted it when it didn't have new root growth. The new root growth helps them to better adjust to the primeagra, I think. After soaking the primeagra in the bleach solution and then in a superthrive solution, I replanted it in the primeagra. The sole surviving root has formed a branch, and it has new aerial roots, too. Good luck with your plant, and I hope you see new root growth soon!
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