How often do you top off your aquarium? - The Planted Tank Forum
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post #1 of 14 (permalink) Old 09-04-2017, 09:18 AM Thread Starter
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How often do you top off your aquarium?

My water level drops about 1/2 to 1 inch a day. I'm not sure why as I never had this problem on small tanks. Maybe it's the increased surface area of the larger tank? I'm thinking I might have to put a lid over the tank to slow the evaporation.

How often do you have to top off your tank?

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post #2 of 14 (permalink) Old 09-04-2017, 09:41 AM
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My water level drops about 1/2 to 1 inch a day. I'm not sure why as I never had this problem on small tanks. Maybe it's the increased surface area of the larger tank? I'm thinking I might have to put a lid over the tank to slow the evaporation.

How often do you have to top off your tank?
With my 65 gal. I top off around half a gallon every 2-3 days. Quite often since I use aquarium water in watering my potted plants. I am also lucky to have a safe and fresh tap water, so I simply fill a small bucket from the tap and fill my tank.
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post #3 of 14 (permalink) Old 09-04-2017, 11:05 AM
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I found if I added floating plants it made quite a difference to the amount of water I lost due to evaporation.

I must admit I do have an aversion to duckweed though.

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post #4 of 14 (permalink) Old 09-04-2017, 11:07 AM
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I top off my 50 gallon about every 2 to 3 days with 1 gallon depending on the relative humidity in the house. I use a 1 gallon milk jug and 2 drops of Prime and pour it right in.


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post #5 of 14 (permalink) Old 09-04-2017, 11:45 AM
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I also use my fish tank water to water my potted plants, so I have to top up the tank every 3~4 days, and then on the 7th day comes the water change day since I do weekly water changes due to my EI dosing regime. sometimes I get busy(AKA Lazy) and don't top off the tank till the water change day.
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post #6 of 14 (permalink) Old 09-04-2017, 11:56 AM
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Our fifty gallon with no lid drops a similar amount every week. I do weekly water changes with five gallon buckets and bring it back up to the rim at that time. I hope this helps. Brian
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post #7 of 14 (permalink) Old 09-04-2017, 01:48 PM
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Continuously. My 125 loses between 5-7 gallons a week even being mostly covered.

Three letters: ATO.
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post #8 of 14 (permalink) Old 09-04-2017, 02:05 PM
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ATO for sure. Especially when you have evaporation issues like that.

I have auto top-offs on most of my tanks - especially smaller ones with more sensitive critters - to make sure parameters don't get outta whack. Also use RO/DI water so I'm not adding minerals/hardness to the water, since those things don't evaporate.

Some of my 5-10gal tanks probably lose half a gallon every couple days in the summer. In part because of fans I typically have blowing across the water. Larger tanks can sometimes lose a gallon or so per day.


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post #9 of 14 (permalink) Old 09-04-2017, 05:45 PM
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I have a glass canape on my 65g so I never have to top off. I realize that a glass canape can reduce effective light penetration, but it does protect the light, ensures against jumpers, and reduces/eliminates evaporation requiring top offs.

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post #10 of 14 (permalink) Old 09-04-2017, 08:15 PM Thread Starter
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I might have to give that ATO a try. I also need a RO unit too. My water parameters keeps swinging. I lose crypts a lot because of it.

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post #11 of 14 (permalink) Old 09-05-2017, 04:28 AM
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How often do you top off your aquarium?

If possible always top off with ro because in a sense that is what is evaporating out of your tank leaving the minerals in. So by not adding RO but adding tap you are adding more minerals on top of what is already in there your levels steadily climb.


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post #12 of 14 (permalink) Old 09-05-2017, 09:04 AM
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I was running fans on all three nano tank(45p, uns 3N, mini m). Out ac went out so I needed to keep water cool. I was going through 1g of rodi a day. Now that the ac is fixed. Hardly any water evaporates


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post #13 of 14 (permalink) Old 09-05-2017, 12:11 PM
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All my tanks are covered so pretty much never need to top them off unless my life has been crazy hectic and I have gone without water changes in ages. Even then it is rare. This is one of the reasons I stopped doing open top tanks.
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post #14 of 14 (permalink) Old 09-08-2017, 02:14 AM
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I have a 29 gallon tank with diy sliding lids and i usually lose around 1/2-1 inch of water to evaporation each week. So i usually top off once during the week.
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