Refugium water level won't stay consistent.

Ya, but it would be the DT backing up, not the refugium.

 

True, and perhaps there was but and the overflow's filled more than usual -- but it would also limit the level in the refugium and permit the pump to suck air. I think this is a 100+ gallon tank if memory serves, and I am assuming a 2 overflow setup. If the one backed up (perhaps not 100%) the other may also then be taking more flow....just a thought.

 

cool

 

where is evaporation being accounted for?

 

Im trying to compile the questions so i can get them answered, so ill try. Im also gonna go make a sketchup after i make this post.

The Tank has 2 overflows. 1 goes to the Wet/DRy(no more bioballs). The second goes to the refugium. The capacity of the overflow is much greater than the return pump. There is nothing between the baffles and they're a good inch and a half apart. Theres nothing wrong with the ball valve, I can make it completely stop the pump if i want to. Evaporation is probably a factor since I have MH's.

Hopefully that answered some Q's. Im of to draw a sketch.

 

ok , i attempted in google sketch and i had no luck. I might try simply paint.

 

Any way to post a pic of your overflow and the sump instead of a sketch?

 

i could but i have no idea how to resize it.

 

Does your W/D and 'fuge each have their own return pump?

 

Use the resize option in paint....