Yah J
Seriously Ive tried almost everything. Heres other big prob its in nano 12 gal.
TIGHT......... It didnt do before with stock pump.
One of my prior fish guys tried to fix and next morning I nooticed he almost killed my fish cause he yanked pipe of and it was only pumping in back

I really don't know how they survived to be honest........
I wont go there!!!!!!!!!
Maybe you could look at when your here..
Anyone else have this problem? FIXES!