Depends on how much algea I have to scrap off the class and if filters need clean. On average 45 mins to and hour on the 150. About 20 mins on the 75, 15 mins on the 55 and about 10 mins on the 30. One reason the 150 takes so long besides the algea scrapping and the size is I take out all the rocks and decor my other tanks don't have any decor
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