Can anyone tell me what this is on the urchin I ordered? It was smaller when I recieved it but has gotten larger within the last 5 days I've had him. I have a 14 day guarantee from the website I ordered from so I am wanting to know if this little guy is gonna make it or if I should let the company know so I can get a credit for him. Been feeding him extra seaweed to make sure he's full. Anything else I can do to help the little guy?