Every now and again my Maxi jet 1200 starts puffing out bubbles, since its in the rear chamber of my D-D24G nano marine tank I can’t easily what’s going on.
Around every 2 months it seems to clog up within the intake guard.
I cleaned mine last night but it was still puffing bubbles constantly.
On the D-D 24G there is a wier gate that alters the flow of water in the rear chambers, I’ve found that as standard there isn’t enough water filling the 3rd chamber, so I’ve tilted the wier comb slightly which allows more water in. And it seems have sorted the problem.