I use the same stock tank as my koi pond. Don't have to worry about raccoons shedding this on. Had deer fall into it once or twice. They made it back out, but surely got scarred. It is incredible how sturdy it is and it can withstand strong freezing winters. Our tank is set into the soil and was once frozen half way down! Never cracked. It has been in use for 8 years now. I wish they would made them in this diameter only have the depth. Would make cleaning for the ducks easier. For now we use kiddie pools with drain valve on the side for our ducks. Koi pond is off limits.