A moving Magnifica is not a happy one. He can/will kill coral he walk over and may end up at the PH or overflow which can wreck the whole tank. I would worry and try to arrange a place that he will be happy at.
The best place for them is highest on a flat rock right under the light source with plenty of current. Moving away from this spot means less light and current, will keep him at that spot. Even if the condition there is a little less than optimal, he will stay. He will try to move to scout out for better place but if you follow this formula, he will always walk back to the top. If the condition there is so bad that he cannot tolerate it, he will inflate his foot and let go of the rock to flow around to find better place. If this happen disaster will ensue.