My toadstool has gone limp

I bought a toadstool a few months ago and it stood straight up with about a 5 inch stalk. Now the stalk has kind of folded over on itself and it doesn't extend up very much. All of the polyps fully extend during the day, but it just doesn't stand up straight anymore.

It is a little high up in the tank, and in a decent area of flow. Could it be trying to get away from too much light? or maybe it's getting too much flow?

Any ideas?