AWC Daily amount?

[Manose]

Tank-160gal Red Sea 750xxl v3
Sump-40gal
---------------------------
With rock and sand total water volume about 120gal
I am back to doing a AWC daily in the morning between 8am -11am(my lights come on at 11am) and was thinking doing 2gal
What do you guys think?

 

[Auquanut]

I'm currently doing 2 gallons daily in my 125 (probably just over 100 gallons total volume) spread out over a 24 hour period with 12 "changes" occurring once every 2 hours. Probably a little overkill, but my tank loves it.

 

[Manose]

I'm currently doing 2 gallons daily in my 125 (probably just over 100 gallons total volume) spread out over a 24 hour period with 12 "changes" occurring once every 2 hours. Probably a little overkill, but my tank loves it.

I was doing 1.2gal on my 80 gal over the whole day and wanted to try something different on my new tank by keeping them daily but shortening the time span.
I use a DoS to do mine

 

[Auquanut]

Sounds like a plan. I use a GHL Maxi stand alone system.

 

[Daniel@R2R]

BRS recommends starting at around 3% and dialing it back to around 2%. Randy Holmes-Farley also recommends 2%.

 

[Manose]

BRS recommends starting at around 3% and dialing it back to around 2%. Randy Holmes-Farley also recommends 2%.

Then maybe I will do 2.5gal per day. I had run 3gal a day for the past 2 days and wanted to see what everyone recommended before I go on.

 

[SPR1968]

I do 5% weekly water changes in both my systems using Apex DOS and the total weekly amount is divided into 7 days between the hours of 9.30 and 12.00

DOS just makes it so easy once the whole system is set up for auto water changes and it makes the hobby so much more enjoyable.

 

[Randy Holmes-Farley]

I usually aimed for about 1% (very roughly), and I show what 1% daily theoretically accomplishes here:

Water Changes in Reef Aquaria by Randy Holmes-Farley - Reefkeeping.com

http://reefkeeping.com/issues/2005-10/rhf/index.php

for example:

Figure 12. Nitrate concentration as a function of time when performing daily water changes equivalent to 0% (no changes), 7.5%, 15% and 30% of the total volume each month (in other words, 0%, 0.25%, 0.5% and 1% per day). In this example, nitrate is present at 100 ppm at the start, and is accumulated at a rate of 0.1 ppm per day when no water is changed.

 

[Daniel@R2R]

I usually aimed for about 1% (very roughly), and I show what 1% daily theoretically accomplishes here:

Water Changes in Reef Aquaria by Randy Holmes-Farley - Reefkeeping.com

http://reefkeeping.com/issues/2005-10/rhf/index.php

for example:

Figure 12. Nitrate concentration as a function of time when performing daily water changes equivalent to 0% (no changes), 7.5%, 15% and 30% of the total volume each month (in other words, 0%, 0.25%, 0.5% and 1% per day). In this example, nitrate is present at 100 ppm at the start, and is accumulated at a rate of 0.1 ppm per day when no water is changed.

Oops! Thanks for correcting me on that, Randy. I thought I'd read 2% in there.

 

[Randy Holmes-Farley]

Oops! Thanks for correcting me on that, Randy. I thought I'd read 2% in there.

I might have recommended different values over the years. lol

 

[Laith]

My AWC is about 1% per day (16.5l a day).

 

[BCSreef]

1% a day for me.

 

[xiaoxiy]

3.75% daily for me, for a total of 20g weekly.

 

[Bryan68]

Just curious, when using the dos for water changes and knowing all pumps have inherent metering error. How much error are you guys seeing a far as input volume over output volume? Do you see a gradual change in salinity?

 

[Manose]

Just curious, when using the dos for water changes and knowing all pumps have inherent metering error. How much error are you guys seeing a far as input volume over output volume? Do you see a gradual change in salinity?

I haven't noticed and problems and I have mine going for a long while.

 

[xiaoxiy]

Just curious, when using the dos for water changes and knowing all pumps have inherent metering error. How much error are you guys seeing a far as input volume over output volume? Do you see a gradual change in salinity?

No drift noticed over the past 4 months and as mentioned above, I do about 20G a week.

 

[Bryan68]

Go to know you guys aren't seeing any drift, as I'm thinking about doing the same. Thanks for the replies.

 

[Peach02]

Sorry if this is thread hijacking but how often should the sandbed be cleaned if you do AWC, or just gauge it by how dirty it looks?

 

[Daniel@R2R]

Sorry if this is thread hijacking but how often should the sandbed be cleaned if you do AWC, or just gauge it by how dirty it looks?

Good question. I'm still new to AWC, but I've been stirring mine periodically just before the daily water change.

 

[Manose]

Sorry if this is thread hijacking but how often should the sandbed be cleaned if you do AWC, or just gauge it by how dirty it looks?

I take a turkey baster and blow the very top layer and let my floss in the sump do the cleaning