Thank you for that information. I would only be putting in some small goldfish, and I have always kept them in a large container and never used any kind of filter for them. In fact, I used to have a few goldfish in my horse trough, and they caught any bugs and mosquito larva that got in there, and seemed to live happily enough in the trough. The horses would come and drink, and the goldfish would swim to the bottom of the horse trough, so they never got accidentally swallowed by a thirsty horse; and I never had to try and get the baby mosquitoes out of the trough. Plus, I really enjoyed seeing the little goldfish swimming around in there when I was out watering the horses.
Of course, when winter came, it was way to cold out there, so then I had to catch them and bring them inside the house.
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