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how often would a water change be required and how much ?
my zebra tank setup is 60 ltr tank/ 6 zebs / fluval 3 internal filter/ temp 84-86f /

cheers

Im not sure to be honest everyone is different when giving advice on changes.

Personally i have a juwel rio 125 tank 125 ltr, fluval 4 internal 10 Zebs, and i do a 15 - 20% change every day or 2nd day