Evap prevention on an open top tank

[TangoTank]

For things like short vacations, can you add plexi or something else handy to the top to buy you some extra time? I have a 75 gal. I am also going to attempt to make a no-electricity ATO system using gravity into the sump. We'll see... Any other ideas, thoughts, tips or tricks??

 

[mr_X]

You do not want to prevent evaporation. You are better off topping off than hindering gas exchange.

 

[TangoTank]

You do not want to prevent evaporation. You are better off topping off than hindering gas exchange.

Boo... My mom, a non-fishtank type person will be tending my aquariums. But real basic stuff--feedings, checking to make sure equipment is running & topping off the big tank. We won't be gone long enough to interfere w/ the PWC schedules. I didn't want her to have to deal w/ knowing how much to put in & IDK an average of how much evaps out. I will just have to draw lines for her & say "Fill 'er to there..." It will be fine but I worry a lot regardless.

 

[mr_X]

Look into an auto top-off then. You can make one pretty cheaply, or you can buy one like the JBJ ATO.

 

[huma-huma]

You could always top off right before you leave and put a lil extra in. Our 125 goes through about 1-2g a day