dual herbie overflow?

So I was leak testing my tank and startinng to dial in my dual herbie overflows and im having an issue with the overflows teterting high and low.I am using a squid wich I believe to be the problem.

210dt 120display sump/fuge
mag24 return with a 1 inch scwd 1 inch return lines(2)
2 inch drains 4 total 2 with gate valves(wayyy overkill I know but I have oddly bad luck lol)

Im thinking about drilling a hole in the overflowbox to keep the waterline in 1 place?

 

Any ideas?

 

The idea of a double herbie to drain from 2 tanks to 1 sump is great. But why 2" drain lines? That's pretty big. That's the only thing that seems wrong with it to me.

How much head loss will there be?

 

I had that same problem in the beginning when I set up my 225. I found out that the tubing I was using wasnt long enough so I had to buy longer tubing and kept putting more down the pipe until it finally stopped. But that was only me. I thought the herbie only used 3 pipes? Maybe to much air?

 

Not much 7 feet or so....as for the big drains...theyr so its harder to flood my tank with a clog lol sounds extreme I know but u don't get much worse luck then mine so im covering my bases then covering them again lol...this was partially my dads doing he said I can build a big tank but what ever would be considered safe or enough of something to do with leaks he wanted it doubled...so 1 ich drains would have worked so 2inch is where its at.

This is 2 herbies 1dt 1 sump. I have 2 overflows 4 drains total 2 with gate valves 2 open.overflow boxes are on either end of the tank 1 valved drain and 1 free. Flowing drain per overflow.the pump also will be running reactors and other filters.

 

It's possible the 2 herbbies are fighting themselves. It's a tough adjustment. But try to close 1 completely off and see if the water level stabilizes. This will tell you that the 2 drains are fighting each other. Once you have determined if they are fighting it will be very difficult to balance the 2 drains. Basically you will have to balance the draw from both drain lines

J

 

The side the flow is comming from has the correct height inside the overflow box.the opposite side drains faster or fills slower.

 

Not sure I understand?

 

I have a scwd that alernates the return current from one side to the other.so if flow is comming out fo the left side of the tank