Type slower and more clearly and we will be able to help you more concisely. You also do not need two threads on the same issue.
You RSX will work just fine off the LP output tank (puts out approximately 450psi), but it's really pushing it with a Spyder unless it's a really good, high-flowing tank regulator (most on the market are nowadays).
Another thing, asking a member if he knows what the marker is is kinda counter-intuitive as he just replied to your question. If you have a question about the marker, just ask it.