Ok I have had my new tank set up for about 3 weeks now. It's a 90 gallon bowfront. Anyway when I had it all set up I added 50 lbs of cured live rock and then about 25 lbs of rock from my existing tank. The rest was going to go in this weekend. Anyway all test have been good the entire time, Ni-0, Na-0, Ammn-0 So two days ago I put in my two clownfish from the other system. Prior to this I added some snails and hermits and one cucumber. Tonight I found the cucumber dead. My nitrates are still 0, my ammonia is still 0, but my nitrites have jumped up to .50. Anyone know what could have caused this. Am I going through another cycle? Should I get everything back in my old tank ASAP?