you don't need dursos really. the full siphon can just be thru bulkhead. i tune the flow so it just barely trickles into the secondary standpipe. You make the standpipe / emergency drain taller to raise the water level in the overflow box and make it as quiet as possible.

so the emergency also allows you to balance the height of the water in the tank?

the height of water in the overflow box. the standpipe/emergency should still be a bit lower than the overflow weir / cutout so you don't raise the display's levels.

my cut outs give too much gap between euro brace and water height thats why I asked, instead of closing off the depth of the teeth I thought it would be easier just to raise the standpipe?

I need to raise the tank level basically

i guess you could but would that scenario skim the surface as well? i'd personally silicone a strip of glass inside the overflow to raise it up a little. it could be glued behind the existing teeth.

argh yes you are right, time to get the silicon gun out ;)

Brilliant help thanks.

How much gap you guys leave from water height to Euro Brace? I dont like seeing much of a gap but also need room for turbulence.

1.5"

there should be no need to make adjustments , heres how it works


your primary drain is your workhorse , this is going to be a full syphon. basically open your gatevalve all the way and then slowly close it untill water level is rising not falling. once the water height is about 2" above your standpipe fine tune the gatevalve closed so it matches your return, now you have a bubble free super quiet drain,fine tuning may take a little bit.

the height of the primary standpipe sets the water level in the box , shoot for about 1/2-1/3 of the overflow box so there no noise of rushing water.

no durso is needed imo and its easier to fine tune the water level looking directly at the top of the standppe, we designed your tank in a way that no fish or snails are getting in unless they are under 1/4" in size.

the water in the box wont have a lot of flow as its all syphon and it collects ditrius so be sure to clean in reguarily.

for the emergency set it at water height , i like to keep this dry untill emergencies arise, never restrict your emergency or use it for more than a trickle.

the weir is 1 1/2" deep from the eurobrace this allows for a 1" water line in the tank.


be sure to test it before walking away , test the emergency and i use marks to fine tune my primary, if after a few hours it goes down slightly ill just barely tune it....after a while the sweet spot is found.


cheers


denny
concept aquatics

Denny he wants to raise the level in the display...