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I was thinking the larger canister produces more flow but it also has advantage of more volume to grow more sponges. I too have different eheim sizes . The smaller ones really don't have that much output . That is why I thought smaller would be the way to go. But if you can use larger canister and drop the flow rate , that's worth trying . I have to admit I am not expert but just thinking out loud . Your trial and effort will be the best evidence of whether to go this route or not.
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