So this morning I woke up to notice one of my fish was missing in the tank. I looked all around the tank for it and couldn't find it. Then checked the filter to see the fish had been sucked up on it and was stuck on the filter foam. Unfortunately I thought the fish had died but soon enough it moved on the foam and I put it back in the water immediately. The fish seems okay just a little isolated right now. My question is, is this a a common problem? I heard different reasons to why this could happen but I want to make sure it doesn't happen again. I heard sometimes fish get into mischief and sometimes the filter is too strong so I turned the filter down now. Im sure this is not a common problem but does it happen? Hopefully my fish will make it. What do you guys think?