Consider this for your new setup :biggrin:

http://www.beananimal.com/projects/s...ow-system.aspx

Uses a herbie style drain (syphon), with a caflo or coast-to-coast overflow. Surface skimming to the max. phillybean sent this to me

thanks, just what I needed.

Steve

I'm still not sure how the siphon break and herbie are connected?

If the question is are there other ways to avoid siphoning the main tank into the sump then you're stuck with either a very shallow return, multiple siphon break holes, or a check valve.

drill another hole
 

if its the small hole thats is getting clogged there are several quick options:
1) just drill another hole
2) drill a bigger hole
3) drill another 2 holes
4) drill another 3 holes
i think you get the point.
And there seems to be some confusion on connecting a herbie to this small hole on your return...... they shouldn't really affect each other. If it is, please elaborate thanks
chin

quietest system
 

steve this method makes the overflow dead quiet. Once you've had Herbie, you will never go back!

You could plumb in a true union check valve in the return line.

+1

That's the first thing I thought of...

I've yet to find a reliable check valve for saltwater use. the buildup of detritus and calcium carbonate always causes the check valves to fail over long term. Holes near the water line of the return is much more reliable especially if you get a stick and poke through the holes every 4-6 months.

Check out the "Wye check valve" on Bulk Reef Supply. Their video shows it as being a superior design, and easier to maintenance.

Check valves fail, siphon holes plug but a big sump can't go wrong.