New RBTA - How do I get him to stick?

[Koresample]

i put my LTA on the sand right next to my rock 'mountain' and he attached himself almost immediately and stayed there for a month or so, then, after my clown that was hosting it died, he moved to the back of the tank into an impossible-to-feed position. We went away for the weekend,and when we got home he had moved around the side of the rock and was facing the side of the tank in an easy to feed position (yeah), then 30 minutes later moved back into an even worse position...sigh. i want to add another clown soon, but I'm afraid that the nem will stay in the back and once the clown hosts, i wont ever see it either....I read all the cool things about these animals beforehand, but i don't recall seeing anyone write about the ulcers they cause their keepers!