First off very sorry to hear about the crash. I too am fairly new to this and the learning curve is harsh.
What others have said about the cycle taking much longer that expected is so true. My nano is so much easier to take care of now than it was 6 months ago. I have added/removed nothing in that time( except water) it just keeps getting more and more stable.
One thing nobody has talked about yet is surface agitation. By using a canister filter you have limited gas exchange in your fitration system so it increases the importance of having the surface of your tank turning over to get oxygen mixed throughout your entire water volume.If your pump and power head both are not causing ripples on the surface of your tank this could have made oxygen levels lower than expected and add another factor into this problem.Just an idea from one newb to another.
Good luck getting things going again
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Biocube 29 est 05/05/08, Koralia 1, 30lbs live rock, ,yellow tail blue damsel, pair cinnamon clowns, baby snowflake eel,Toadstool , metallic green mushroom, assorted zoos , kenya treen
180gall display, 190 pds live rock, virgate rabbitfish,bluejaw trigger, bubblletip anemone,yellow tang, sailfin tang,melanarus wrasse, cloud wrasse,
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