Metal in ponds

My husband has cleaned up an old cast-iron down-pipe from our roof and has put it in our small pond so that the frogs and toads can hide in there for cover. I think it will be detrimental to them - do you agree? Many thanks
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My husband has cleaned up an old cast-iron down-pipe from our roof and has put it in our small pond so that the frogs and toads can hide in there for cover. I think it will be detrimental to them - do you agree? Many thanks
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DOES IT STILL HAVE PAINT ON IT?
THAT IS THE ONLY HAZARD THAT I CAN THINK OF.
THERE ARE RIVERS IN SOUTH YORKS THAT RUN ORANGE JUST BECAUSE OF THE NATURAL IRON OXIDE IN THE WATER. NO HARM TO AQUATIC LIFE THOUGH.
I have frogs in my well and I use an cast iron pump.
Thank you all for your replies - it has got paint on it so we will remove it. My husband said he liked the idea as it stayed down beneath the water whereas a plastic pipe needs to be weighted down. I love that we have frogs and toads in our garden and want to do everything I can to preserve them Very best wishes to all.