So me and three other guys spent about an hour leveling out my tank with wood shims. The tank was completely level so I filled it up half way. I let it sit for about 3.5 to 4 hours checked the level again seemed basically perfect. Filled the rest of the tank and I notice a site slope around a quarter of an inch. Should I empty the tank and re-level it or will it be ok. Might be even less the a quarter inch difference.