Alright so I need everyones' opinion here. I have a 120 gallon tank. I believe it is an Aqueon. It has two overflow boxes with the undersized holes drilled for 1 inch ABS bulkheads . Currently I am running a single durso in each overflow box. I am building a new sump and when I install the sump I am planning on running a Herbie drain in each overflow with the returns running behind and over the back side of the tank. The dursos are terribly noisy and do not provide much redundancy. I am hoping the Herbie method will be much more quiet as well as add redundancy. I do not have an Apex currently, but I am planning on purchasing one soon. When planning out the upgrade I thought of an idea regarding Apex's FFM. My question is, would it be advantageous of me to install flow monitors inline with the emergency drains so I can monitor the flow and be notified if the flow is greater than normal? This would indicate that something is cutting off the flow from the main siphon since the emergency is working harder. Would this add redundancy or reduce redundancy since it adds a point of failure (blockage) and theoretically will reduce the total flow the emergency drain can handle? I don't quiet know if the pros outweigh the cons. Or would it be better for me to install the flow sensors on the main syphons and monitor the flow that way? Initially I thought it was a pretty good idea since I have two overflow boxes and the Herbies would work independently of one another so the likely hood of both of them failing at the same time is low, therefore installing flow sensors on the emergency drains would be a good idea. But I want to hear from you guys! What do all you guys and gals think? Thanks in advance!