View Full Version : Water evaporation question

01-04-2010, 10:09 AM
I don't have a top on my 180 gallon tank. The water evaporates quite a bit so I have to add water every few days. Does this mean I don't need to do as much water changes? :confuzeld: :confuzeld:

01-04-2010, 10:39 AM
Water changes = dilute the toxins (a.k.a. nitrates) which have no other way to get out of the aquarium.

If the water evaps quickly, then the nitrates reach a toxic concentration quicker (water leaves, but the toxins stay behind thus increasing the total pollution of the water left behind).

But for planted tanks, this is what you want ;). Fish only tanks, you do not want the toxins to build up.

01-04-2010, 10:46 AM
Remember, though - if you put an additives in the water (such as cichlid lake salt) this DOES NOT leave with the evaporation. You should add dechlorinator to the new water but, no additional additives.

01-04-2010, 11:35 AM
Makes sense. thanks for the advice

01-04-2010, 12:51 PM
Very welcome!

How much evap water do you have to replace daily?

If your tank is in a relatively small room, you might be able to ad a humidifier to help with evap.

I think a few folks use a drip system were there is a steady drip into the tank to help counter act the evap.