Got the rocks back in, must say its not the best layout but it will do.. For now.
On another note im having the same problem as my last tank. My overflow pulls plenty of water but not enough to keep up with my pump, i turned the ball valve but its literally right before closed and my sump still stays with low water level. Gonna be a long few days..
Not sure after. Overflow is a built in overflow, probably could have been fixed up a little before i started using it. Pipe size varies i believe full return system is 1" and overflow pipes are 1 1/4" going to have to double check.