Hello all, This is my version of the BA, and the Herbie combined; I call it, "The Todd" Works like this: I had bought a 180 with 2 x holes for a 1.5 I.D. Bulkhead already horizontal in a top corner. I added the C2C overflow myself to the upper back out of glass. This is silent, has it's own 'emergency' overflow- if/when the water rises in the overflow the tip of the black hose goes under water turning the Secondary whole in to a full siphon 1.5" drop 9.5ft to my sump beneath. Normally, this line just trickles down to the sump- taking up the slight extra while the 'primary' line with the gate valve- stays at full siphon. No matter what the 'primary' line is running- the secondary will always flow- unobstructed down to the sump. The 'primary' runs at full siphon by restricting the flow to closely almost match the flow of the RP. The rest going down the secondary which also pulls a bit of air into the secondary thru the black tube. Again, if/when the water level rises in the C2C, the black hose goes underwater and turn the 'secondary' into a Full siphon, quickly emptying the C2C.- I"ve of course tested this numerous times by shutting off the 'primary', and it works great, and is silent. The outer Sanitry 90 is a 1.5" I.D. Fernco Fitting- before you bash it, I even talked to the lead engineer at Fernco- It's Reef Safe! The Rubber sanitery 90's/3-way also takes all the pressure off the glass/bulkhead!- I know- Damn brilliant idea! Again- others used them too with no problems. This is my 180 Again, I did it this way for two main reasons: 1. The 180 I picked up like new already had the 2 x 1.5 I.D. bulkheads drilled in it 2. After reading and getting feedback from others who did it like this- I knew it worked.