I was looking for some input on my drawing I've seen a few people running these through the rear of their tank without boxes used outside the tank. mine in a see through tank and I only have room on the sides about 15" so I thought about a coast to coast setup. you can see the pics to understand. it's a 125 gallon. would this work and would it be quite? I'd also install gate valves to adjust flow. any input. thanks