Pecan shells for tannins?

[Jess]

I raise mosquito larvae for my fish in buckets outside (my partner loves this...not), and I've noticed over the years that when a pecan nut from my tree falls in a bucket, the water becomes beautifully colored with tannins.  Looks like a blackwater paradise in there.  I almost exclusively keep blackwater fish.  Could anyone foresee potential problems of adding 1-2 pecan seed pods in my tanks?

These are, as far as I know, regular, run-of-the-mill pecan trees.  I have catappa leaves I do sometimes add to the tanks, but they don't color the water much (I don't add that many).  I've entertained adding a few pecan pods for a bit and then removing them.  There are lots of different seed pods sold for this purpose, but I don't know what kind of treatment they might undergo first...

I don't use any fertilizers or other chemicals in my yard, and I would scrub them before adding...  Thoughts?  

[Schuyler]

Do you have a dog or anything that poops on the ground near the tree that the nuts could have come in contact with?

If so I would at least boil them briefly but I'm not sure where the line if between taking all the tannins and killing the bacteria

[Anjum]

Pecans contain juglone (like walnut), which is probably toxic at some concentration. I wouldn't risk it. 

[Jess]

On 9/9/2022 at 6:38 PM, Schuyler said:

Do you have a dog or anything that poops on the ground near the tree that the nuts could have come in contact with?

If so I would at least boil them briefly but I'm not sure where the line if between taking all the tannins and killing the bacteria

I do have a dog!  Didn't even think of that...

On 9/10/2022 at 12:33 AM, Anjum said:

Pecans contain juglone (like walnut), which is probably toxic at some concentration. I wouldn't risk it. 

Ahhhh ok.  I didn't know that; glad I asked and thank you for replying!