Water marks on aquarium

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HumanBean

Redtail Catfish
MFK Member
Nov 4, 2014
1,940
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Toronto Ontario, Canada
I use to change water every two weeks close to 80%. Even then inside glass of aquarium was not that dirty and less water marks. Now I am changing water every week due to the fact that two much water marks or calcium may be. For a month or so the only change in my setup is that I have added purigen . that's it. Any ideas why ?
 
water marks as in the evaporation lines with some deposits on them? just have to scrub them often (everytime you water change) and they should never get too out of hand.
 
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