High Nitrite

[MistersMom]

the 2 of my betta's in my 10 gallon have died, this was my school tank! i have a filter, and i cleaned up after them often, so why did the nitrites get high enough to kill them!?!?

[sarahspins]

What was the level? Had you recently done anything like change your filter that could have disrupted the state of your tank?

[MistersMom]

i havent changed the filter...and i have strip tests not the kind that say the actual amount..... the water itself was pretty normal though! it looked fine!

[Pogthefish]

Nitrite does not build up enought to be visible before it kills your fish.

[MistersMom]

Well. My fish have passed....