pictures of the intake pipe and how it stands in the tank?
(I saw a 2nd post with pics)
you should invert the intake or make it horizontal...
but it should be pretty easy to fix as a diy solution...
you can grab a co2 diffuser like this:
View attachment 308252
grab a mesh big enough to fit the inside spiral impeller type of part of the diffuser
glue it to a piece of pvc pipe (with a closed cap at the top) that will fit the mesh inside it
and then make some diagonal cuts on the pvc pipe...
this will make the whole thing spin around the mesh and clear it of any debris...
more flow more spin xD
it should look something like this:
View attachment 308254
you have to change the top of the mesh for a center support for less resistance so the flow of water can turn this thing easier
the pvc doesn't need to be glued or anything to the mesh as the water flow will push the impeller inside making the outside pvc pipe turn
and those cuts on the pvc pipe will do the magic of turning and turning and turning clearing any outside debris and the impeller any inside stuff