My 3/4 inch guppy was sucked into my Aquaclear 50 in my 20G. I just don't want it to happen again, it was horrible to see.
Guppies usually get sick or are very weak due to their small body size/immune system. Guppies will/can get sucked into the filter if they are naturally weaker than usual or are dieing. But most healthy bigger fish will not get sucked up. ( neons and bigger fish )
It wasnít until 1853 in London when aeration and filtration of water was understood, that people
were able to keep fish as indoor pets.