Which one could you recommend? Wouldn't 2026 be too "powerful" for 120
litres? But I've read there is no such thing as too much filtration.

There may not be too much filtration, but the 2026 may be too much current
or flow for whatever fish you'll be housing... maybe just run 2 smaller
canisters, or 1 canister and 1 HOB filter... the options are endless....

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is that better??