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Old 04-20-2015, 10:42 AM   #11
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Small powerhead. Fluval Sea CP1 I think.

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Old 04-20-2015, 10:43 AM   #12
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I'm hoping to add a hectors goby in the near future, if that makes a difference.

Obviously acclimatising would take longer.

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Old 04-20-2015, 10:45 AM   #13
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Your LR could be consuming the carbonates(kh) as mentioned and causing low pH.
I had to buff my 75 reef at least every week for kH and Ca yet the tank next to it(with cultured{man made} LR) never needed a thing!
try to keep your kh up and the pH should follow.
Do you have a lid(sealed) on tank?
If so that is holding back gas exchange and causing the co2 to rise lowering pH.
Open the lid or look into a screen top if so.
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Old 04-20-2015, 10:46 AM   #14
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Either way, I don't see a problem. Ph fluctuates through the day and what you've described isn't out of control. Just sounds like the natural swing through your day.
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Old 04-20-2015, 10:51 AM   #15
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Quote:
Originally Posted by coralbandit View Post
Your LR could be consuming the carbonates(kh) as mentioned and causing low pH.
I had to buff my 75 reef at least every week for kH and Ca yet the tank next to it(with cultured{man made} LR) never needed a thing!
try to keep your kh up and the pH should follow.
Do you have a lid(sealed) on tank?
If so that is holding back gas exchange and causing the co2 to rise lowering pH.
Open the lid or look into a screen top if so.
Kh at 12 should be OK though? Maybe a calcium buff needed?
Having said that, its a fluval edge so totally covered. This could be it!

I'll be looking to mod the lid when I can afford to upgrade lighting.

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Old 04-20-2015, 10:53 AM   #16
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Quote:
Originally Posted by Sniperhank View Post
Either way, I don't see a problem. Ph fluctuates through the day and what you've described isn't out of control. Just sounds like the natural swing through your day.
Cheers. Seems to stay at 7.6 whatever time I test at.

And 7.6 is the lowest reading on my kit (red sea). I just hope it isn't much lower.

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Old 04-20-2015, 10:53 AM   #17
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The lack of gas exchange is probably your issue.
You could just lower the level alittle to allow more air into tank and see over a couple of days if it helps bfore major re construction.
My 75 went from 12-13 to 6-7 in 1 week for over a year!
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Old 04-20-2015, 10:55 AM   #18
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Ta. I'll try that

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Old 04-20-2015, 11:07 AM   #19
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I've got a 23L edge set up, live rock, a peppermint shrimp and a couple of Halloween Hermits.
Recently I've noticed the pH drop from around 8-8.2 down to 7.6. No ill effects on the inhabitants but I can't understand the crash.

Water I buy is 8.2 and the hob filter provides the oxygenation. I've got a reasonable whack of crushed she'll in there too.

Any ideas on the cause?


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This caught my eye.
Do you have actual crushed shells or is it crushed coral.
There is a HUGE difference and excessive shell fragments is one suspect in elevated phosphate levels.

If it is actual shell, you should actually remove it if practical and get some form of aragonite rock or sand.
I just picked up some of this, Carib Sea Rubble Zone, chunks of aragonite rock and it's on sale right now;
CaribSea Rubble Zone: Aquarium Substrate

that would help buffer the ph/alk slowly and should help maintain it.
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Old 04-22-2015, 03:02 AM   #20
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With a 12 dKH, I'm not surprised that it's difficult to change your pH. That's the thing Alk does, chemically. It stabilizes pH.

How are you raising your Alk? Or is that the level water changes make it?


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