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Old 01/04/2018, 12:32 AM   #1
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Phillybean's Avatar
Join Date: May 2006
Location: Kelowna B.C.
Posts: 615
High PH - Won't stay down

Tank has been running since September. PH has been around 7.9-8.0. In the last three weeks it has raised up to 8.55. I've had poor polyp extension during this time. Today I dosed vinegar to bring it down to 8.2. Within 15 minutes there was noticeable increase in polyp extension, but 5 hours later, it is back up to 8.45 and polyp extension is down.

Parameters are ok, 1.025, 0 phosphate and nitrate, Calcium 420, DKH a little low at 7 (all API), Mag at 1350 red sea. I run biopellets and carbon in reactors with a Vertex 150 skimmer.

Tank is a 90 gallon inwall that shares a room with the furnace/hot water heater/washer & dryer.

How can I decrease it back to the 8.1-8.3 range and have it there consistently?

It's not how much is costs that matters, it's how much you told your wife it costs!
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Old 01/04/2018, 07:39 AM   #2
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Join Date: Sep 2003
Location: North Carolina
Posts: 17,691
I would ensure your PH test is accurate before doing anything though..
But here.. multiple solutions to high PH

Being blunt and having fun
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Old 01/04/2018, 02:11 PM   #3
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Join Date: Mar 2002
Location: Mountain View, CA, USA
Posts: 87,496
Anything below 8.6 should be safe. You could dose soda water instead of vinegar, to reduce the likelihood of a bacterial bloom.

I agree that the measurement is a bit suspect. Does the tank have a skimmer? I'd make sure the water surface was clean and had a good rippling motion. That's seldom a problem, but it can lead to pH issues. More aeration should bring the pH down, if there's actually a problem. Is the tank getting Kalk or any high-pH alkalinity supplement added?

Jonathan Bertoni
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