When HN users recommended it
1 HN user recommended this in 2021, in one comment.
20072026
Each tall tick is one HN user's first recommendation. A short tick is the same user again. Click a tick to jump to the comment.
1 HN user recommended this in 2021, in one comment.
Each tall tick is one HN user's first recommendation. A short tick is the same user again. Click a tick to jump to the comment.
Fish tanks require copper to maintain proper levels of nitrifying bacteria, the first two nitrifying stages require copper to convert stuff to the "safe" nitrogen that requires flushing to remove (unless you have real plants in the aquarium, then you rarely need water changes) - furthermore, copper is used to cure several fish diseases[0], so it it's impossible to be as bad as you claim.
[0]https://smile.amazon.com/Seachem-67105650-Cupramine-Copper-1... for example