how much top off water do you use?
 

Hi all, so my tank is only two months old and its a 75g, i been noticing i have to top off my sump with RO water everyday about 2L worth, i was just wondering what everyone experiences were, how much is everyone toping up daily and if there were any mods you guys have done to slow down the water top off

It varies from tank to tank (humidity, temperature, etc.). My tank do 10 gallon every week so yours is nothing compared to mine (mine is a 70 gallon).

Your tank is pretty typical. Really the only thing you can do is put glass or acrylic covers on your tank top and sump but this can cause other problems: reduced light to corals, more cleaning to do, potentially reduced air water contact area.

Most reefers just deal with it and rig up an auto top off system that draws from a reservoir that you only have to refill maybe once per week.

Personally my system loses between 6-8 litres every day!

this weekend i added a 90 degree elbow to my protein skimmer outtake and its seems to be working, i have noticed less salt creep and less air bubbles in the sump, i though of adding a filter sock on the down pipe to further help reduce salt creep

Switch over to a herbie drain, no bubbles

I have to top off roughly 8 gallons in my 1000 gallon system, 4-5 gallons in my 220 system, and a litre in my 65 gallon system.
I just add it every morning.

About 30g every 14-16 days for me on my 75g.

No idea as mine is now automated, but when it was manual, running MH lighting, about 5g per day.

I have an approximate total water volume of 550g and my tank needs about 2-3g/day in the summer and I'm thinking a bit more in the winter, around 4g/day.

144 gallon display, 50 gallon sump

I use about 3 gallons a day

Mine is low because as others have mentioned, surface agitation increases evaporation.

I use a Beananimal overflow so no bubbles and my skimmer vents under water so again ... no bubbles. I have virtually no salt creep in my sump and area.