"Hank Barta" wrote in message
news:PS7Xb.296918$I06.3042025@attbi_s01...
Michi Henning wrote:

I suspect that 40ppm or more wouldn't be unusual in many fish shops.

Why would you think that? Every time fish are sold from a tank,
some of the water is sold with them and replenished at the end of
the day. Except for tanks that hold low volume sellers, there is
probably about 25% water change in these tanks on a weekly basis.

Also the shops are more likely to underfeed than overfeed their stock.

What sort of conditions would be necessary to get ammonia up to 40ppm?


how about when they receive their new shipments and dump about a 100 or more
guppies or Tetras into the tank. Large LFS may pay 99cents for a Cardinal
Tetra that they sell for $3.99 however to get that price they have to order
perhaps 500 or more. The losses are high due to initial ammonia spikes.

Rick