I had the same problem.
I took some ridged plastic tubing about 5/8" diameter that I had laying
around and cut 4 pieces to and hot glued them to form a rectangle the
same size as my skimmer opening. Then I hot glued some black plastic
fruit tree netting across. You can go finer with the mesh but then you
will have to clean more often. But it keeps the small fish out of the
skimmer.


pixi wrote:
Right now I am reluctant to run the waterfall which runs the filter and
skimmer because I have a very few baby fish and don't want to hurt them.