I have an eheim 2215 on a 29 gal
and lately it seems the outflow is weaker than it used to be.
I took it apart and cleaned it today. But still weak! Any suggestions??
Also if I shake the canister it spits out a little air.. Almost like its trapped air and never fully pushed it out. But it doesn't seem to help I've been shaking it a bunch to get the air out.