How to create Siphon break for drilled return

[Yellow Eyes]

I just upgraded my 20g nano to a 40 breeder with a 29 gallon sump. My 20g had an over the top return so I was able to drill in the siphon break holes. However my new 40g (which I bought used) had a 3/4" drilled bulkhead for a return. The problem is that its drilled close to 2"-3" below the top of the water. (I also have a check valve but I know, mechanical, bound to failure). It is loc line so I have the nozzle pointed up close to the surface however with the Mag7 pump I am using it creates a ton of splashing that is starting to spread salt creep over the sides of the tank.

Does anyone have an solution to how I can create a siphon break with this set up?

My idea was to buy one of the loc line splitters, and a ball valve, and set the second split closed down to a trickle close to the surface that would suck air in the event the check valve breaks.

 

[hogfanreefer]

You could use a longer piece of lock line and curve it up to just below the surface and angle it down a little. I would never depend a hole drilled in the top of the return line for a siphon break. They can and do get clogged.

 

[UFO8MyCow]

I have a bulkhead a couple inches below the surface and will be using a combination of elbows inside the tank to form a Z and raise the return up so that thebottom of the top fitting is just below the surface. then drill the bottom of the top fitting and screw in the lock line

 

[Indymann99]

+1 run the lock-line up to the surface but keep just below the surface. Make sure your sump can handle the back siphon of water when return is shut down.

 

[jiperalta]

I drilled a very small hole in the locline (make sure hole points down towards water) and another small hole in the return pvc just below the waterline.