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- Apr 20, 2019
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I have a 75 Gal. tank with a HOB fuge and a 20 gal. sump so roughly about 100 gal.system since cycling I have been changing 15 to 20 gal. every 5 or 6 days now I'm thinking I may be over doing it, not allowing all the "good" organisms to take hold, What do you think? Thanks.



