Reef Safe with caution. LOL Cherokee (my ancient and 99% blind chocolate lab) was the store mascot. Customers would even by her treats and stop by just to see her. When the front door opened and the alarm made that beep, she could get to the front of the store no matter where she was without knocking over product or running into other customers. She was our unofficial greeter. Well, Planet reef had sumps that were 9 foot pits dug out of the floor. One time I was talking to a customer and I could see the whole wall of aquariums filled with weird brown strands floating in them. Yep, Cherokee was swimming in the sump. (When she died, all of the employees chipped in and bought Tyson, my Boston Terrier).