If the orange spot is a single, and not part of a pair, it would probably be fine with seahorses. It has been listed as a threat level of 4 because it is so difficult to keep, and seahorses are so difficult to keep, that they ought to be kept separately successfully before being attempted together. If the orange spot is something you've been keeping successfully for a while now (many, many months/years), then I could see that working, but they can be too aggressive in pairs. Make sure to quarantine the seahorses, not just to watch for illness and proper feeding, but also to get to know their behavior before you mix the two. I would go for a single pair of good quality captive bred erectus from somewhere trustworthy like Seahorse Source. No need to risk the health of the filefish with less than stellar seahorse stock.