is my acrylic overflow box design perfect?

its for my 15 gallon nano. here are the pics. let me know if im wrong......

 

NO.....you're missing a chamber to hold the water prime in the second stage.

You need another separator...

 

this looks exactly like my old diy overflow...but i didnt diy lol, a dude made it because i am no where near that skilled...but yeah mine looked exactly like this except it had the siphin tube sticking out of the top...the flat top piece in you drawing!

 

Where, i dint get you. can u show any pic or sumthin. the water dolds in second chamber.

 

I would make a mini durso or put a sponge prefilter on that 1" pipe to limit gurgling and splashing noises. Also, I would recommend a smaller pipe diameter, maybe 3/4"? 1" drain on 15 gallons I think is a lot.

 

heres a pic of the old one (yea i know huge sandstorm lol this was right after we filled the tank up) see the black tube on top? thats the siphon hose i was talking about...other then that i think yours looks exactly like this one i think!

 

There, Reefqueens photo is perfect, you see how the water in he second chamber goes over the back wall, down, then up again? this prevents the chamber from loosing the prime. In your drawing, it just goes over the back wall, and straight down...if the return pump stopped, all the water in the overflow would go straight down and the siphon would loose it's water inside.

Of course, if the gray tube sticking up is made of solid pipe, then this will hold the water back and the idea is correct. I think I was assuming he gray section was a prefilter of some sort, but now that I see it again I followed the arrows, and it seems like you were planning something solid in it's place.

 

oh your right i didnt even see that, yes it seems mine has 1 more baffle (is that what they are lol?) then yours does...sorry i dont have an eye for details lol

 

the grey pipe is solid pipe and not pre filter( u can see the arrows). there will be a nylon bag tied on the outlet going in the sump. so will i need the extra wall?

 

overflow box pic edited

is this u people are talking about?