Evaporation = water change??

Analisemcg

Hi, so to start i have a 20 gallon with 4 rasboras. it doesn't have a lid, so i get a ton of evaporation, maybe 2 gallons per week which was usually the same amount as my water change before i got rid of the lid. my question is, do i need to still do my 2-5 gallon water changes per week or can i just refill what evaporated? thank you!
 

kansas

You still need to do water changes. If you continue to add water without removing any, the mineral content will continue to rise, as the minerals are left behind when the water evaporates. Your aquarium water will get a higher and higher mineral content and over time this will harm your fish,
 

bettasXD

You still need to do water changes. Maybe like remove another 3-5g and then top up removed + evaporated amount. Water changes are mainly to get rid of nitrate after the tank is cycled and not removing water defeats the purpose of it.
 

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