Plumbing Question

[Blue Reef 06]

I am planning my plumbing setup for a new 125gal RR tank. It has two overflows, each with two holes drilled into the bottom of the tank. I was going to use the two larger holes in each overflow to drain to my sump and the two smaller holes for returns. This does not leave me with a way to plumb an emergency drain (at least not that I can think of). Given that I will have two drain pipes, is this asking for trouble or should it be ok? If it is a major hazard, I could convert one return line to an emergency drain and run that return up over the back of the tank, but I would rather not do this if it can be avoided.

Thanks for any advice you all have.

 

[oscarinw]

As long as you don't pump water into the tank faster than your drains can manage, you should be fine. Of course, this leaves room for human error. My recommendation to you would be to use one large as drain, and the second as emergency drain (plumb it an inch higher) with both the smaller holes as returns. This certainly assumes that your one drain can manage all your flow, but picking the return pump carefully, you should be able to accomplish it. This way, you will also be able to accommodate a gate valve under the main drain and have a herbie drain which can be dead silent.
Feel free to PM me with questions.
Good luck