I did the paper test and the paper went straight in between the tank and stand. Contact Redsea and they told me that there is no cause for concern. I ask for a brace bracket and they said they only have bracket for the 600,700 and 900 series. The only difference between the 500 and 600 is the tank height. The 500 has the same flawed design as the 600 series. Please don't buy any redsea products anymore if you are thinking about it. Redsea has lost my trust.