I've been there before, from Ocean Forest to mixing my soil. From my experience, I don't see any difference between using Ocean Forest Foxfarm or any other products VS Mixing my soil. It all works the same, the only difference is your $Money that you're spending :). Dragon fruit plants don't require expensive and rich soil. The most important thing you need to keep in mind is "drainage" and make sure you have proper drainage by using Perlite, Pumice or Sand. It will help your dragon fruit plants thrive faster than stressing out on getting the right soil for your plant. Again, I am here to help you from my own experience, and everyone has their own way of growing. Happy growing!