Manganese overdose ! - The Planted Tank Forum
 
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post #1 of 9 (permalink) Old 09-12-2016, 07:20 AM Thread Starter
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Manganese overdose !

Hi,

Yesterday I realized that I had 0.5 mg/l of Mg (magnesium) and I went and added enough (173 gr) of MgSO47H2O to achieve a 6 mg/l of Mg in the tank, from a new tin I bought a month ago from my usual chemicals specialist. To make a long story short: the label in the tin said MgSO47H2O but it was actually MnSO44H2O ! Imagine my surprise. So I have added 14 mg/l of Mn (manganese) to the pond. All of you can guess to whom I'm going to put to shame ! I guess I can thank these idiots to not confuse the content for a more dangerous compound!

Being Mn a trace element, I wonder if it could be harmful to plants & fishes (carassius). Is it? I have only found this link https://www.plantedtank.net/forums/11...manganese.html where happi states that Mn does not stay too much in water. But why?

I have read that in plants in general (crop), excess of Mn could inhibit absortion of magnesium, molybdenum and iron...I am afraid too that even if not harmful, it may render useless to add Fe or Mg.

Do I have to worry? Should I try to remove it (ion exchange resin, not possible by changing water: 3100 lt) and buy a Mn test kit? Will it disappear? What should I do?

Thanks a lot!
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post #2 of 9 (permalink) Old 09-12-2016, 08:04 AM
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No idea if it would cause any problems, but a quick water change would get your levels down.
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post #3 of 9 (permalink) Old 09-12-2016, 06:23 PM
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Quote:
Originally Posted by Darkbluesky View Post
Hi,

Yesterday I realized that I had 0.5 mg/l of Mg (magnesium) and I went and added enough (173 gr) of MgSO47H2O to achieve a 6 mg/l of Mg in the tank, from a new tin I bought a month ago from my usual chemicals specialist. To make a long story short: the label in the tin said MgSO47H2O but it was actually MnSO44H2O ! Imagine my surprise. So I have added 14 mg/l of Mn (manganese) to the pond. All of you can guess to whom I'm going to put to shame ! I guess I can thank these idiots to not confuse the content for a more dangerous compound!

Being Mn a trace element, I wonder if it could be harmful to plants & fishes (carassius). Is it? I have only found this link https://www.plantedtank.net/forums/11...manganese.html where happi states that Mn does not stay too much in water. But why?

I have read that in plants in general (crop), excess of Mn could inhibit absortion of magnesium, molybdenum and iron...I am afraid too that even if not harmful, it may render useless to add Fe or Mg.

Do I have to worry? Should I try to remove it (ion exchange resin, not possible by changing water: 3100 lt) and buy a Mn test kit? Will it disappear? What should I do?

Thanks a lot!
0.5 ppm of Mn is quite a lot, you might not see serious affects on fish health right away, but it might cause some issue to the plants temporally, its better to do few water changes to reset it. BTW all the traces need to be well balanced in order for them to be absorbed by the plants, adding extra Mn in excess amount might become issue if Fe becomes low, they both need to be kept under control.

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post #4 of 9 (permalink) Old 09-12-2016, 06:58 PM Thread Starter
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Hi, thanks for your replies.

I have contacted with the seller, and he confirmed his mistake and the compound MnSO4 monohydrate, so the Mn in water is actually 18 mg/l (I assumed wrongly it was tetrahydrated). I have found some papers where they state that the LC50 (lethal concentration in 96h) ranges 2-4 mg/l for surface waters' fishes in British Columbia, and around 5 mg/l, in a paper where it was tested with a cyprinidus fish (same family than goldfish)...

I have put some fishes in a temporary pond with new water, the rest of fishes escape to my net: tomorrow morning I'll empty the pond to catch the rest before it is too late. I hope they will not have sequels, please...

I'll refill with RO water + tap, it will take 3 days. The plants will suffer for sure.

Maybe I'll filter with cation exchange (H+ form) resin or mixed bed resin, the last 200 liters, instead of emptying totally. Or if not posible I'll empty completety the pond, and sorry if there are some very small fishes from last spring...

Links:
Ambient Water Quality Guidelines for Manganese
Comparative toxicity of eight metals on freshwater fish. - PubMed - NCBI

Hi

The fishes are now in a new clean water pool, with no manganese, but that has been between 24 and 36 hours after the overdose, I am worried about fishes health.

Please, do you know some medication/product to health or detoxify fishes when intoxication by heavy metals? Maybe there is something out there? Or maybe some of you has medicated some time fishes for this?

I have read some papers explaining the health improvement (even curation) of severe manganese intoxication, by applying sodium para-aminosalicylic acid, but this is for humans and I would not dare to try a thing like this blindly.

Do you know of some product or treatment, please?

Last edited by Darkblade48; 09-15-2016 at 08:45 AM. Reason: Please use the edit function for back to back posts
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post #5 of 9 (permalink) Old 09-13-2016, 07:01 PM
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Originally Posted by Darkbluesky View Post
Hi

The fishes are now in a new clean water pool, with no manganese, but that has been between 24 and 36 hours after the overdose, I am worried about fishes health.

Please, do you know some medication/product to health or detoxify fishes when intoxication by heavy metals? Maybe there is something out there? Or maybe some of you has medicated some time fishes for this?

I have read some papers explaining the health improvement (even curation) of severe manganese intoxication, by applying sodium para-aminosalicylic acid, but this is for humans and I would not dare to try a thing like this blindly.

Do you know of some product or treatment, please?
Seachem Prime (or the dry bulk equivalent I forget the name of, but it's way more economical for large tanks/ponds) supposedly detoxifies heavy metals in water; I don't think it would be a viable option for treating your OD-ed pond but you could probably put some in with the rescued fish. I don't know if it would get into their systems and but it almost certainly wouldn't hurt... I hope someone has a better answer for you. Good luck!
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post #6 of 9 (permalink) Old 09-13-2016, 08:52 PM
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The treatment for fish is probably the same, you just need to figure out the dose based on body weight.

Prime does not detoxify metals; it does not contain any chelators.
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post #7 of 9 (permalink) Old 09-13-2016, 09:01 PM
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Originally Posted by Solcielo lawrencia View Post

Prime does not detoxify metals; it does not contain any chelators.
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It will also detoxify any heavy metals found in the tap water at typical concentration levels.
Seachem - Prime
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post #8 of 9 (permalink) Old 09-14-2016, 12:04 AM
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I thought Safe was the dry form of Prime all this time but Safe doesn't state any ability to bind metals. So I guess Prime is actually better for water changes. Good to know.
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post #9 of 9 (permalink) Old 09-14-2016, 07:54 AM Thread Starter
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I am afraid that these heavy metal conditioners are formulated to remove the typical amounts of heavy metals in tap water not a x100 concentration so I don't know if they really would help, of course I ignore the amount of Mn retained by fishes body...
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