Quote:
Originally Posted by 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 is directly affected by whether the Tunzes/wavebox are on or not. The same thing happens when the 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.
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The exact same thing happens with my two Tunze 6105s that I have on a controller. Mine also slow down at night and stop during feeding. I always wondered why that was (the change in volume in the overflow). I guess the powerheads pushing water in the tank force water out of the display tank faster? It isn't an issue for me either though because I do the same thing as you :-)