I put a baby betta in my 20g community tank and couldnt fine him for about 48hrs, finally I started looking around a lot closer and found him/her in my Aquaclear 50. He got sucked up the intake and was swimming around under the foam pad along with a Scarlit badis. Scared the beejeebees out of me. Both were pale for awhile but perked back up and the Betta turned blue within about 30min. Ate right away as well. (I have since put a pre filter sponge on the intack.)