260 gallons in water changes 120 in top off = 380+3589=3969
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Forgot the waste water and top off 450 waste a month 50 top off total 500
3061 +500
Total= 3561 gallon
75g tank
20g water change weekly
5g topoff every four days
20x4=80g
7x5=30+2.5=32.5g
So 112.5g a month