Erratic herbie's?

[fkshiu]

What are you using for flow inside the display and is it attached to a night timer?

I've got Tunzes and a Wavebox hooked up a multicontroller which turns off the wavebox and reduces powerhead flow at night. My Herbie flow and sump level are directly affected by whether the Tunzes/wavebox are on or not. The same thing happens when they are paused with a feeding function. This effect is exacerbated because I only have a single overflow box on one side so the wave created by the wavebox is constantly varying the amount of water overflowing into the sump.

I solved this issue by setting the Herbie at a level where there is a trickle of water down the emergency drain during normal operation. When the Tunzes/wavebox are off there is less flow so the level in the Herbie drops back to just at the lip of the emergency drain. This works because the amount that a Herbie flows (which will affect sump water level) is dependent on the height of the water pushing down on the main drain. Since the water height never changes with my set up, the herbie's flow is minimally affected.