I just got a new aquarium and found out the hard way that there was a leak in the overflow. With the pumps on in the sump it work perfectly however if the power were to go out I would have 300 gallons of water on my finished basement floor! So I was wondering if there was a type of valve that I could instal that would turn the water off when the water got too high in my sump? Would a float valve work and how would one install that? Do they have a valve that shuts off when the electicity goes out similar to how emergency lights come on?