does a 75 evaproate more water or a 29?

will a 75 gallon or a 29 gallon evaporate more water in a week. the reason i ask this is because i want ot upgrade to a 75 thsi summer but dont have enough money for more than ten gallons a week or less. which is all i need for top off and a 10% water change. just wondering.

 

more water volume = more evaporation

I have a 90 with 30 gal in sump and mine takes about a gallon a day, but I also live in a dry climate.

 

so if i had a humidifier then it would help slow down evaporation? if i used tap water could that get into my tank? just wondering..

 

evaporation is a function of surface area and kinetic energy (energy of activation)

so since the tanks are the same temperature, the one with more surface area will be faster.

 

never experaminted with a humidifier, but I think I read on here where someone said that should help with evaporation

 

my parents said that i need to use RO water for the humidifier too. is that true? im just trying ot find a way to keep down my evaporation.

 

you don't need RO water for the humidifier but it is better for it. You could also fit lids on the tank/sump to help with evaporation, if you are worried about O2 then you could put an airstone in the sump.

 

i was thinking since evaporation is the problem (thats not a problem) i would add a Auto Top Off device of some sorts that might help if ur issue is filling it or fluctuation in salinity also sounds like u might need to save up for a ro di unit and buy salt in bulk , a ro di unit would save you a bunch of money and hassle

 

i was considering, to put glass panes on top of the DT. that was the evap would slow. the sump would remain open. less surface area and still have gas exchange/cooling. you wouldnt have any salt creep up to the lights as well. has anyone put glass between lights and the water?

 

it reduces your PAR so if you have a lot of corals and not super strong lights, you may have growth problems