Ambassador Posted April 8, 2021 Share Posted April 8, 2021 I’m setting up a new stock tank outdoors that I will be stocking with some fancy goldfish. I’d like to purchase some Aquarium Co-Op sponge filters and I see the large size is for 40+ gallons. Should I be using 2 of this size for a 110 gallon or does the “40+“ mean 1 is sufficient? 1 Link to comment Share on other sites More sharing options...
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