No, it's not normal. Your fish might be sick. I had a pleco who got stuck to the filter a few times. I was worried it was too strong of a filter...but I had angelfish who weren't very big who would hang around the filter with the tips of their dorsal fins actually up in the filter vents, and they could swim away with no problem. We came to the conclusion that there was something wrong with my pleco that had made him way too weak if he was getting stuck to the filter like that. He died not long after. :'(dacota34 said:Hi thanks for reply. I is it normal for fish to be stuck in filter vents i had one last night??