My mag is behaving strangely. Been with me almost two years and has been rooted in place. Last week or so it's been moving around its rock a lot and folding up its base. I got it as a split from a fellow reefer, and it's about the same size now as before the last split, so I'm thinking that's what's happening. Any thoughts? No signs of any deflation, so I don't believe it's sick.