Acceptable daily salinity swing

[PDR]

I am having to manually top off one of my tanks for now and was wondering what is considered the maximum acceptable daily salinity swing. And by acceptable, I don't mean that the system will survive it, but more or less not notice it.

Thanks

 

[DEWreefing]

I swing up to .001 point with tempature swings.
1.025 to 1.026

 

[laverda]

I have never track the changes in day, but I know your fish should be able to handle pretty big swings as the salinity can change significantly in the Oceanus to underwater springs, storms and runoff.

 

[PDR]

I should have explained this in my original post, but I am, unexpectantly, having to go out of town for about a week and will not have a chance to get my ATO up and running before I leave. I have a tank sitter coming every other day and am trying to determine if 2 days of evaporation would cause too much of an issue.

Testing over the last couple of days seems to result in an evaporation rate of about 1/2 gallon per day on a minimum of 35 actual gallons. Using a calculator online, it seems that 1 gallon of evaporation should only change the salinity by .0008.

I know the fish can handle it fine, but what about other inverts and coral?

 

[LobsterOfJustice]

It takes a lot of evaporation to noticeably change salinity. Topping off every other day should be fine. Luckily, things handle a quick drop in salinity (like dumping in a gallon of fresh water to replace several days worth of evaporation) better than they handle quick increases, and the evaporation will happen slowly and consistently.

 

[DEWreefing]

On my 220 total gallon system I can go through a lil over 5 gallons. When my ato quit working my tank shot up from 35ppt to 38ppt while I was out of town. I lost like 4 sensitive acroporas.

 

[jdpeters]

I know this is old but I had my dad watch my tank when me and my wife were on vacation. It went 7 days without being topped off and heater became exposed. Everything lived. Speed forward to yesterday my ato dumped about 3 gallons into my display and after checking the salinity it was at 1.024-1.025. I try to maintain 35ppt. Not sure how bad my salinity was to begin with. I check with a hydrometer and I think they are realitively accurate but the community is generally not a big fan. The same time my heater went on the fritz and brought my tank up to 82. I pulled it out and put in a small replacement which overnight dropped it down to 76.1. I hope my tank looks fine when I get home lol