how much top off water do you use?

[Midway]

Back when I had my 2 90s, I had a reservoir of about 15 to 20 gals plastic bin, I had to top it off every 3 to 4 days, that got annoying very fast like someone said it here. On my new 260G build, I went completely automated, now I have a floating arm that connected straight into my water filter. I just do a bit of maintenance every month or so and I forget about it.

[Madreefer]

144G display
55G sump
55G frag tank/refuge
Approximetely 5g is pumped from reservoir

[mikepclo]

120g + 40g sump @ 1.5-2g per day running Leds

[Sunee]

60 gallon display, 15 gallon sump, I use about 3 gallons a week in the summer and double that in the winter (ATO from resevoir).