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When doing water changes I fill my tank all the way up to the black plastic, where it is almost touching the over hang. I do weekly water changes, so I don't top off between water changes. If I happen to do a bi-weekly water change, then it takes about 1 gallon of water to top off.
 

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Premium Member
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Same as everyone else, no space between the trim and water level. I have 7 tanks and usually need to add water to 4 of them between water changes since I change water once every 3+ weeks and 4 are open top tanks. I'll add about 5 gallons of water between the 4 open top tanks (2 20g talls, 1 33g, and 1 44g) on a weekly basis, more if the weather is really hot.
 
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