Evaporation - what is a reasonable amount

[Coralgurl]

I turned my MP 40 down a bit last night but only because I added a couple of new clowns and a maxi mini, just letting them settle a bit. I had it turned up about 75% for the last month for both surface movement and to clean up the sand.

I really only noticed the increase in the evaporation with the addition of the fuge, cooler temps, and the furnace being on. Over the summer, I topped up every couple of days, wasn't nearly so much. The tank temp is 79-80.

Sounds like this is normal. Phew!

[spawn]

I lose 5 gal every 4 days on mine, RSM 250 with open top. It's gotten a bit faster since the cold. You should just get an ato...they're the best.

[cwatkins]

I think I lose about 5 gallons every 4 days as well on a 90 open top with hood and 2x 250W MH. My ATO uses a 5 gallon old salt bucket.