Unstable siphon...help!

[JingoFresh]

Hmm, thank you all.

I bought the more powerful pump and indeed there was no overflow, but an airpocket appears instantly after a few hours and stays there.

I will try lowering the overflow and see if that changes things.

 

[SammyL]

Did the new pump fix your problem?

 

[JingoFresh]

Yep, new pump fixed everything. No residue in refgium and no more air gaps in siphon