Drain pipe not draining help!

[m and m]

So im lost here guys and I know its something simple I just cant figure it out. My drain wont drain. I just got done 8 hours of re plumbing my tank. My drain isn't draining enough to keep up with my 1k return. Its a 1.25 inch pipe with a 90 on the end in the over flow. Right under the tank its a union fitting and on the end of that a nozzle with flexible tubing on it into the sump. From bulk head to sump its about 12 inches. The over flow wont handle more then about 200GPH threw it any advice on why it is draining so slow? no its not clogged or anything to turns or anything just literally straight down.

 

[m and m]

Fixed it I just wanted to post my result. For some reason with with vynal tubing on there it slowed it down a ton IDK why but I just cut a piece of PVC and bam everything is fine.

 

[caudill187]

Glad it worked out