Main drain possibly clogged

[jdpeters]

I have to tune my gate valve on my 40 gallon reef basically daily. The water level in my external overflow box slowly rises over the course of the day. My sicce sdc6 has been service. Can I possibly put a gentle snake or auger down my main drain? My plumbing is nearly impossible to take apart. I designed it for the my previous home and have moved since so it’s dang near impossible to disassemble.

 

[rayadog]

I don’t see why you couldn’t snake it given the angles of your plumbing. Depending on how long you need to reach, they make some pretty gentle cpap tube snakes that someone once suggested on here that I’ve used now.

Are the wiers clean and free? Definitely sounds like water is being delay somewhere; 2 big obvious points but if your pump so good it might be the overflow. Return tubing could be obstructed I guess too?