Three lessons learned in three weeks:

[Merbeast]

25ppm of nitrites will kill fish fast! and if they were that high after a 70% wc that means they were around 60ppm before. are you shure your not talkin bout nitrates?

I'm pretty (as in completely 100%) sure. It was an API freshwater master test kit. The nitrite test is one bottle. The test solution comes out blue. The test solution turned a slight purple shade that I and my old lady determined was about the .25ppm bar color (the first bar above 0ppm on the test kit). The test reads up to something like 5ppm (or thereabouts... I'm not at home to look at the kit right now). I tested ammonia (0ppm), nitrites (.25ppm), nitrates (5ppm) and pH (7.2).

P.S. Aaah, I see. I forgot the "." in front of the 25. .25ppm sounds about right.

 

[wataugachicken]

what did you feed the endli before it died?

 

[Merbeast]

frozen (freshly thawed) bloodworms from Hikari. I took some tank water out, put the chunk of frozen bloodworms in it and let it sit for ~5 mins before putting it back into the tank.

 

[Merbeast]

I am still feeding from the same batch of food, and no other fish has had problems with it (afaik).