Caliban07
Aquarium Advice Addict
Could be your tap water is naturally high enough in salt (or chloride ions) and this is protecting the fish somewhat.
'Salt can be used to prevent nitrite poisoning, if the chloride ions are 30 times the concentration of nitrite ions.'
http://www.algone.com/using-salt-in-the-freshwater-aquarium
Hi delapool. I'm not surprised the ops fish are ok. I found out some very interesting things from my research thread on the toxicity of nitrite to fish. I don't want to go around saying people's fish will be ok in 5ppm nitrite as I'll probably get a bit of an ear bashing but all I'll say is I'm not surprised they are fine.
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