I'm preparing to start my first 150gl custom build and I've done some blue prints but now I'm rethinking because I didn't realize (current tank 55gl not drilled) the tank I'm looking at will be drilled and have 2 overflows (only planned for one when this was all a thought) anyways I'm going to use a 40gl breeder for sump (I think still in debate) and I'm wondering about flow rates. How is this calculated? Is each tank different? Is there some sore of rule of thumb to go by? This will also effect the size of PVC
I use too right?
The tank I have now I bought all set up so I didn't get to experience this before
thanks in advance for any help!