Possibly? I’ve taken out the skimmer and checked it for clogged sponge, missing cover, etc and I didn’t notice anything like that, but I’ll go ahead an check again now that I know what I’m looking for!The only other thing I thought of is - could there be some 'entrance', 'tube', etc that is partly clogged - and when you feed - you get kind of a (I dont remember the term) - but its when vacuum causes microbubbles due to high pressure - which when the food 'dissolves' - the small opening is open again? - or some way that food particles are somehow blocking something and some of the skimmer air is going into the water as compared to only into the skimmer?