I added 9 Fathead minnows, the petshop shorted me 1 and a aqueon 75 HOB filter to my 10 or 20 gallon tank. The filter is rated at 400 gph. I couldn't fit the intake guard so I left it off. There is a small guard at the base of the filter.
The day after I added my filter 11 fish were missing. 6 sunfish and 5 fathead minnow. I assumed they got sucked up and died. A few days later I empty my filter to clean it and I see some fish moving. I dumped the filter contents in a bucket but left the ceramic rings in a bag on a towel. I clean the filter get ready to put the rings back in and there was a live fish in the bag. It was out of water for ~10 mins while I cleaned the filter.
Out of the 6 sunfish all survived. 1 of them had some brusing. Out of the 5 minnows 3 survived and 2 died. The dead ones didn't look like they were beat up from the impeller but who knows.
All the fish are now doing great. Within a few minutes of being added to the tank the sunfish that was in the bag found a worm in the sand and was eating it. I was a little surprised that the fish survived a trip through the filter.
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