Well, initial results show that somehow, my Nitrates are off the friggin charts, I'm redoing that because I honestly don't believe they're that high and I'm not experiencing a mass extinction... I just did a 33% water change a week ago, so I have no idea what's going on...Hmm. They usually tolerate anything between 70-80 as long as it is consistent. Could very well be an internal issue we cannot see, Most common reasons for this behavior are rapid changes in key parameters. They are very hardy long term and can tolerate a generally dirty tank. My fowlr stays around 50ppm nitrate, but it rarely deviates from this and my eel is just fine.
Nitrite: 0 (rock bottom... this concerns me)
Nitrate: >160 PPM (seriously, the vial went bright red in a minute. Redoing this currently)