Gourami pulling things from filter

[Lewisjmarten]

I have just brought two gouramis and they seemed to have settled in well however one seems to like to nip at everything, my biggest concern was that one of them has started nipping and pulling things from the filter. Is this normal? What do I do?

 

[Essjay]

There are probably bits of food stuck to the outside of the filter and the gourami has found them. My filter usually has at least one shrimp climbing over it for the same reason.