Any rubber strip around the house will help. It's just to provide friction and increase grip. I bought a 2" rubber coupler from Home Depot and cut a strip from that.
The intakes that point down are for the Ultima 2000 pair. That being closed loop, cannot back siphon. Technically it is in a constant state of back siphon. The two lines that overflow into the sump are at the top, gravity fed.
Got it. Thanks. I’ll go find some rubber when I get to Home Depot this weekend. Thanks for the tips.
Makes sense on the closed loop. I’m wondering how I can get something lower in the water column to reduce the accumulation of detritus and crap. Are there any best practices out there to have filtration near the bottom of the tank?