This AM I checked on my tank and my feather duster was all the way out of it's thing, but still attached to it. I touched the tube and it retracted back in so I'm not sure what's going on. I did move it to an area with less water movement so I thought maybe it wasn't enough current to get the right amount of food. So I moved it this morning back to it's old spot to see if that helps. It was still reaching way out of it's tube. What does this mean?