How much water should I expect to drain from my DT during a power outage?

[Dan_00ryan]

So I bought a sump kit for a 29 gal on eBay and will have it under a 40 breeder that I’ll drill and use the Eclipse S overflow box. The top of the teeth on the baffle to the return pump is 5 inches from the surface and the 29 has more gallons / inch than the 40 breeder.
I’m currently stuck in my house for a while so I figured I’d glue the baffles now before I have the tank.

Is this height safe or should I cut the baffle so it’s lower?

 

[Sniperhank]

That varies pretty heavily. The goal is to have enough room for if there is a power failure to house all of the water can be housed in the sump once the display drains down past the baffles. So the answer is 'maybe'.

 

[Hondatek]

What type of output do you have on your return line ? If you using loc line just keep it towards the top of the display so they syphon breaks fast.