| | Diy?
Fro short term use, just go to Walmart and get a small bit of netting from fabric dept. Twistie it over the inlet. You could also do the same with a bio-bag from the whisper filter, the sort that stretches over the frame. Depends on what you have laying about. I also had bought fish safe foam for filters from Big Al's and cut a chunk of foam to put on the end of an inlet, pretty ugly as I recall.