We have been given a small starter tank plus filter and ornaments. I have cleaned it all and bought some gravel, but now I am having second thoughts as I've never kept fish! Does the filter produce oxygen or do I need a pump as well? How often do I clean it out and how? I can't find a definitive guide on Google, I was thinking goldfish but apparently they grow huge? Don't want to rely on asking at pets at home for advice so if anyone can give me some starters I will be very grateful! Thanks.
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