Main Drain Clogged?

[Kenzo]

I'm running a herbie drain with an extra emergency drain, so 3 tubes to the sump total. I noticed my secondary drain getting louder recently. I figured I could adjust my gate valve on my primary and it would fix the issue. However, I couldn't find a spot to quiet down the drain and ended up eventually trying the gate fully open and everything in between to fully closed and noticed that neither caused the noise from the secondary drain to change much.

I'm thinking my primary may be clogged and I need to snake it, any other ideas I may be over looking or something overall that I'm missing?

 

[Coral reefer]

Can you see into the overflow and make sure it’s not clogged right where water goes into the main drain?
Internal or external box?

 

[SJ701]

Do you have a sea cucumber? My sea cucumber up and tried to move to the sump.. he made it but not without messing with the overflows for a few days.

 

[Kenzo]

Can you see into the overflow and make sure it’s not clogged right where water goes into the main drain?
Internal or external box?

My system is plumbed like this, the main drain is the one of the right. Unfortunately I'm unable to see into it.

 

[Kenzo]

Do you have a sea cucumber? My sea cucumber up and tried to move to the sump.. he made it but not without messing with the overflows for a few days.

I do not, that sounds a like a nightmare to have to deal with if he got stuck haha.

 

[SJ701]

I do not, that sounds a like a nightmare to have to deal with if he got stuck haha.

he got stuck in the skimmer pump .. hes fine now and living back in the display.

 

[Coral reefer]

So is main drain glued in at the bottom of the overflow box? If not unscrew/pull that pipe out and see what happens

 

[MolaMola]

I have a similar drain setup. Is your overflow screened? Before adding netting, I had a large trochus snail get lodged in the main drain. Like @CoralReefer said, you can probably unscrew that pipe. Fingers crossed

 

[divewsharks]

so it was running for some time quielty, and just recently starting making noise? Does anything change at all if when you opened the primary wide open? did you make any changes with your return pump?