opps tank flooded

So im in the process of doing a 135 inwall tank build, i got the room built and the tank in the wall and all trimmed out around the front all that stuff is done. I put water in the tank a couple days ago and made a diy overflow to overflow to the 50 gallon tank below i put ball valves on both the return pvc and the overflow pvc now i have been beating my head against the wall trying to get this thing dialed in. I ran 1 1/4 inch pvc as the overflow and same with the return i have a 1300 gph pump and i have both valves turned about a 1/3 the way i can get the water to stay level in both main tank and sump for about 30 mins then it will either start raising or lowering i have been messing with this for the past 2 days trying to get it dialed in just right and im starting to get really angry then i walked away for a few mins and opps water all over the floor drained out of the main tank through the trim and down the drywall.. Any one have any better and easier ideas on how to dial these things in? any help would be awesome or even if someone would want to come check it out and see if theres something im missing with the pvc overflow this is my first setup that i did a diy overflow everythings sucking right and the pump is pumping right i just cant get the whole TUNING part down..

 

its a overflow made out of a pvc pipe ill take some pics of it tomorrow and post them, I googled pvc overflow and came up with some ideas on how to make one and i played around with it till i got it the way i wanted it, ill take some pictures of the setup and post them up tomorrow

 

I tried with out the valve on the intake side and I had 2 pumps hooked up on the return one was a 1300 gph and the other was a 700 gph and they couldn't keep up and I didn't want to go buy a bigger pump to hook it all up so I cut the tubes and added the ball valve on both intake and return

 

I think I'm going to make a secondary overflow out of 3/4 PVC that just breaks the surface just incase something does happen I always have that back up and I think that should take care of the issue I'm having atleast I hope it'll work I'll post some pics after I get the secondary made up

 

Well after playing around with the first over flow I got it figured out... I had the inlet to the over flow to low in the tank so I raised it up to just below the surface and opened both valves the water raised like it was going to flood over then the water dropped and leveled out now the water Is sitting perfect height in both sump and main tank

 

Ok I cant figure out how to post pictures on here so im just going to copy and past the url to photobucket and see if that works here it is........................ http://s1238.photobucket.com/albums/ff492/seyzar18/#!cpZZ1QQtppZZ20 Theres some pics of the recent project and as you can see in some of the pics the green fans on the ground. Yeah thats from the tank flooding : )

 

Hey Andy I'm curious why you say it won't work, iv actually read alot of threads on DIY overflows and read alot of people's thoughts about it and there's alot of people on reef central that has done this setup for many years without any issues, I got it working right and it hasn't had any problems for about 11 hours now, I even simulated a power outage and unplugged all pumps let it drain completely then turned everything back on and the overflow kept it's siphon the whole time and started back up on it's own without me doing anything but turning the power back on..

 

Just google PVC overflow it will bring up alot of sites and there's some you tube clips of how they work. I had a CPR overflow box on it before and I didn't like it at all. I have done many power outage try's by unplugging the power and every single time it's started right back up on it's own I'm going to stick with this for a while and see how it works it coated me about 14 dollars to make so in time if it doesn't work out it's not a big loss of money or time