Does your tank have bulkheads or an overflow box, or power filter on it? A lot of times tanks look like they are leaking from the bottom, but it's really something else. Water splashing on the top lip of the tank and streams down the side and fills the bottom trim up, which may then leak out at another side of the tank.
Check the top of the tank thoroughly.
I recently had a bulkhead leak on my 265 reef. I first noticed water dripping out of the left side of the bottom trim of the tank. But after investigating, the bulkhead on the right side of the tank had a leak.