Evaporation

[Siamese Fighting]

I have a tank with no lid on, it's about 100 litres and I tend to lose about 2 inches of water (I don't know specifics!) per night.

So when it comes to my 20% water change, is this a reasonable substitution for a portion of my water change? Or do I still take 20% of what is left after evaporation, and then refill back to the normal level?

Just purely out of curiosity! If it saves me time i'll be a happy camper!

 

[MermaidMel]

2 inches per night?! OMG get a lid lol

 

[doresy]

2" of water a night from evaporation, in the UK Have you checked the carpet?

 

[Siamese Fighting]

My room gets very hot..
A few of my tanks don't have heaters and keep at a consistent 26 degrees.

It keeps me nice and thin mind, no exercise for me in this heat!

 

[kewskills]

26 degrees, that's a sauna, it would kill me that's for sure.

 

[Fruba]

Im wondering the same, although i have lost about an inch and a half over around 3 months, though i do have a lid but i am uncertain of where its gone

 

[Craster]

So when it comes to my 20% water change, is this a reasonable substitution for a portion of my water change? Or do I still take 20% of what is left after evaporation, and then refill back to the normal level?

Water changes are intended to remove toxins and other undesirables from the tank. When water evaporates, it's just the water that goes, no nitrates etc - those will all be left behind, more concentrated, in the tank water. As a result the evaporation will not be contributing to your water change requirements.