Hydrogen peroxide and high ph

[Masha]

In this article, the writer claims that hydrogen peroxide can be more toxic to fish if ph of the tank is high.

I can't find any other mention of this, is it true?

Public Enemy #1: Black Brush Algae and how to fight it

I ask because I had some mysterious fish deaths some time ago, and now I wonder if it could have been related to me using hydrogen peroxide in the tank. I used the recommended dose and everything, thought I was being careful, but all my peppered cories died.

 

[Delapool]

I can't actually find it? How far down the thread is it?

 

[Masha]

Sorry yes, it's rather buried. Under the Warning section it says :
h2o2: Warning to higher PH tanks, ie cichlid, It poses a greater danger to live stock at higher PH. Lower dose if you must use h2o2, otherwise go for excel/metricide.

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[Coyne]

My tanks' pH is in the 8.2 - 8.4 range. I've used the normal treatment dosage without any deaths, but I also do a 50% PWC 30 mins afterwards.


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[Delapool]

I couldn't find much. Just one reference that it may lower ph. Guessing that is the extra H. I've had no troubles with spot treating.

 

[Masha]

Thanks for the answers I was surprised when I read that, as I'd not seen anything like it anywhere else.

 

[Delapool]

Do you think the cories and h2o2 were related? Every so often I see it used on infections which seems a little last resort to me but I've never tried it on sick fish to really comment.

 

[Masha]

I was using h2o2 to treat for Algae. I have been assuming that the cories died because I underfed them, but it happened so suddenly right after the h2o2 treatment with no previous symptoms that when I read this, I wondered.

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[Delapool]

Is a bit odd! Seems a link.