Did I get wrong size overflow box?

[Spkarim]

I just sent up my first 20g sump for a 40b with a litereef overflow box that was on sale at LFS.

It looks like overflow box is struggling to fill up. Using 1inch tubing for drain and 0.75 inch for return. I am using a fluval sp2 pump rated for 950 gph. Water level stable in the sump.

Did I set things up wrong, buy the wrong things, or need to do adjustment? Is return flow not enough? Do I need to increase return tubing to 1 inch?

Thanks in advance

 

[Retro Reefer]

Full picture of overflow without blues? Looks to be ok from what I can tell by the picture, it’s not going to get any fuller than the height of that stand pipe

 

[Spkarim]

Sorry, better picture here.

 

[Fish4udog]

Looks normal to me water will only be the height of your drain pipe

 

[Spkarim]

OK thank you, wasn’t sure because inner box side only about 60% full. Didn’t know if that was normal.

 

[sarcophytonIndy]

Certainly wouldn't hurt to have a 1" return pipe, would increase your gph, and might increase the life of the return pump.

 

[Retro Reefer]

That’s normal, they are nice overflows I had one years ago.. just make sure you push enough water through it to prevent any air pockets from forming in the U tube.