Alk continues to drop below floor limit at night

canadianeh

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I noticed that my Alk floor limit frequently drops below 8.6 at night. My target using Trident is 9 but hardly reaching that limit. I compared PH and Alk graphs on Neptune and they seem move in the same direction. High during the day and low during the night.
I increased Alk dosing by 1 ml per day so far and I haven’t seen the impact.

any suggestions?
 
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canadianeh

canadianeh

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What do you have your Trident controlled dosing for alkalinity set to, and how much alkalinity (and at what times) are you dosing daily?
Here you go. Thanks
39B8F40B-A66E-40C4-A9F6-8570014701A0.png
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blaxsun

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Ah, easy fix. Set the value to 8.5 dKH and increase the range to 0.75 dKH. This means Trident will influence the dosing amount between a low of 7.75 dKH to a high of 9.25 dKH.

Right now you have it set to 9.0 dKH, so as soon as the alkalinity drops below 8.6 dKH the Trident stops influencing it.

You may also want to look at a slightly modified schedule. For example, I add more at night, less during the morning, even more during the day, less in the late afternoon and more at night again.

PM me and I'll send you a screenshot of my schedule if you like.
 
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canadianeh

canadianeh

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Ah, easy fix. Set the value to 8.5 dKH and increase the range to 0.75 dKH. This means Trident will influence the dosing amount between a low of 7.75 dKH to a high of 9.25 dKH.

Right now you have it set to 9.0 dKH, so as soon as the alkalinity drops below 8.6 dKH the Trident stops influencing it.

You may also want to look at a slightly modified schedule. For example, I add more at night, less during the morning, even more during the day, less in the late afternoon and more at night again.

PM me and I'll send you a screenshot of my schedule if you like.
But that mean I target for 8.5 instead of 9 though. I want to keep it at 9. Do I need to increase the total daily ml?

please share your schedule for dosing more at night. Thanks
 
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blaxsun

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But that mean I target for 8.5 instead of 9 though. I want to keep it at 9. Do I need to increase the total daily ml?
please share your schedule for dosing more at night. Thanks
If you target it for 9 and it drops below the threshold, the the Trident won't compensate the DOS. You can set this to 8.75, 9.0 (etc.) Just remember that the maximum ±range is 0.75, so anything under 8.25 or over 9.75 won't get adjusted. Here's my dosing schedule - it runs for 2 hours with a 2-hour break in-between (when I dose magnesium so there's no overlap). I target 8.0 dKH with a ±0.75 range and ±50% limit.

Screen Shot 2021-11-25 at 5.34.19 PM.png
 

FishyFishFish

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I’m not an Apex user but I would work on getting the Alk stable before giving control of it to the Neptune.

How much is it dropping, what is your water volume, and what are you dosing? Use a reef calculator to work out how much extra you need to dose. 1ml per day doesn’t sound like a big change, unless it’s a very small tank.

Once the Alk is fairly stable without the Neptune changing the amounts, then you can add it back in to fine tune the levels.
 
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canadianeh

canadianeh

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If you target it for 9 and it drops below the threshold, the the Trident won't compensate the DOS. You can set this to 8.75, 9.0 (etc.) Just remember that the maximum ±range is 0.75, so anything under 8.25 or over 9.75 won't get adjusted. Here's my dosing schedule - it runs for 2 hours with a 2-hour break in-between (when I dose magnesium so there's no overlap). I target 8.0 dKH with a ±0.75 range and ±50% limit.

Screen Shot 2021-11-25 at 5.34.19 PM.png
So in my case I would need to change the range to 0.75 instead of dropping the target level to 8.5.
 
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canadianeh

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I’m not an Apex user but I would work on getting the Alk stable before giving control of it to the Neptune.

How much is it dropping, what is your water volume, and what are you dosing? Use a reef calculator to work out how much extra you need to dose. 1ml per day doesn’t sound like a big change, unless it’s a very small tank.

Once the Alk is fairly stable without the Neptune changing the amounts, then you can add it back in to fine tune the levels.
I have been on Neptune for more than a year. Before that, I dose Alk and Cal manually and recorded my daily dosing on a notebook to get idea of my daily consumption. Lately it keeps dropping pass the control floor limit. I wonder if my tank is starting to consume more? I haven’t added new corals for months. It dropped to 8.4-8.5. Floor limit is 8.6. I dose 2 parts ESV Alk and Cal. 65 galllon total volume.
 

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Has anything else changed recently (e.g. lighting, calcium level, any other dosing changes etc)? Is the Neptune testing once per day (and is this test at the same time every day, at the same time that it has always been)?

If everything is the same, then it could be that you are consuming more Alk, but I would run an independent test just for piece of mind.

I don’t want to give bad info as I’m not exactly sure of your setup or what products you are using, but if you’re using ESV calcium buffer, the calculator shows approx 12ml to raise the Alk from 8.6 to 9 with a water volume of 65 gal.
 
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canadianeh

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Has anything else changed recently (e.g. lighting, calcium level, any other dosing changes etc)? Is the Neptune testing once per day (and is this test at the same time every day, at the same time that it has always been)?

If everything is the same, then it could be that you are consuming more Alk, but I would run an independent test just for piece of mind.

I don’t want to give bad info as I’m not exactly sure of your setup or what products you are using, but if you’re using ESV calcium buffer, the calculator shows approx 12ml to raise the Alk from 8.6 to 9 with a water volume of 65 gal.
The only thing that changed few months ago I started to dose Calcium using Neptune DOS and Trident. In the past, I dosed Alk only and only dose calcium when I need it. Now I dose alk and cal automatically and equally. I know about the calculator and use it when I need it.

I am wondering why it only drops during overnights. It moves the same with the ph. It goes up during the day and go down during night time.

Neptune test 4 times per day
 
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