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Old 03-14-2013, 10:07 AM   #1
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Water changes and Top off - How often?

I'm used to doing weekly WC in my freshwater tanks, but being new to SW, I'm not familiar w/ the "best practices" there...I will be spinning up a 20G FOWLR shortly once my rock is cured.

- How often should I change water? I do weekly PWC on all my FW tanks.
- How often should I top off, and how do I know when to top off? Should I monitor the specific gravity daily, for a few weeks to see what the evaporation rate looks like, and adjust top off accordingly? I don't want to put in an ATO at this time...
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Old 03-14-2013, 10:18 AM   #2
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I have a sump on mine so I have drawn a line on it when the water drops below that line I top it up which is usually every other day. also I do water changes every other week and that seems fine but if you are doing weekly water changes at the moment I would say that would be good as that is what majority would probably recommend anyway
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Old 03-14-2013, 10:19 AM   #3
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I don't plan on running a sump with this tank, given that it's only 20G (and might become a sump for a bigger tank later )...I'll just add it to the rotating weekly schedule of PWCs
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Old 03-14-2013, 06:27 PM   #4
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Sorry yeah you could still mark the tank though to show the water levels dropping, you could also have a look into an auto top off device if it is something that your worried about
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Old 03-14-2013, 08:59 PM   #5
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Is it okay to top off the main display tank with just ro do water? Im currently going thru about just under a gallon a day... Reason im wondering is due to all these new things im hearing on how topping off with ro di will lower calc mag and dkh over time. I want to know why. Why now? Has everyone always buffered their ro di ? I doubt it...
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Old 03-14-2013, 09:26 PM   #6
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When you see the water is low maybe filter splash or you see glass add rodi. Don't let it get to low then there's a swing in salinity . I top off two 32oz cups a day just pour it in tank or sump.buy a 5 gal bucket of to and your good. Never had a problem with adding ro but I like doing weekly wc.
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Old 03-14-2013, 09:31 PM   #7
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I think the way to do it is to top off with RO/DI water, since when the water evaporates, it's only taking water with it, none of the salt or other buffering minerals.
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Old 03-14-2013, 09:49 PM   #8
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True true, i do weekly water changes as well, but i ment the properties of ro di. Neutral and lesser pH value being added directly to our tanks. I heard that with not matching temp and ph of top off water will cause ph and dkh to drop over time.. Not sure why. But i would love to agree with both you. All i ever do i top up about a gallon, over two periods of the day. Ro di is all i use
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Old 03-14-2013, 09:50 PM   #9
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Yes, the temp has to match, and I would assume that whatever shift in pH was caused by the evaporation and increased concentration of the minerals in the tank would be returned to normal when the RODI water was added.
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Old 03-14-2013, 09:58 PM   #10
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I don't think to much about that I just try to keep my hand out of the tank for one day! Like was said I think the minerals stay in and new added with wc.
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