My star fish is melting

[jason604]

So a few weeks ago I notice there was a small tear on the tip of one of the legs of my starfish. Now I notice it's ripping off n looks like that leg is melting. Everything else of it is fine. Its still moving around like normal. This starfis has been in my tank for 7 months now. Should I remove it or let it play its course?

U can see the left leg melting in my pic.