Fish-In Cycling, I Need Help

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elle.michelle

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I have had a few freshwater tropical tanks throughout the years, but unfortunately I had never heard about fishless cycling until now...

Last week, I got my 29 gal tank back from my sister, who had offered to keep it up for me while I moved (It used to be a beautiful healthy tank). It was waterless and had dead plants mixed in throughout the gravel when I got my hands on it, so I replaced the gravel and tried to scrub clean everything else the best I could with hot water.

I let the filter and heater run for 72 hours, then I did what I have always done and thought that I was supposed to do: I bought 3 zebra danio to start the cycling process. Maybe 30 minutes after I let them out of the bag, they were at the top gulping for air and 4 hours later 2 were dead. I did a 50% water change and started researching on the internet and discovered fishless cycling. I feel like an idiot, and I later realized I forgot to clean out the inside of my filter and I am almost positive that is the cause behind the high ammonia level so fast.

One little guy left, I have been doing daily 50% water changes and my ammonia level fluctuates between 0.25ppm and 0.50ppm, my nitrates at 0. I tried feeding him twice, but he isn't interested in food and he had been sort of treading the water in one spot in the middle of my tank. Now, 3 days later he is resting on the bottom and moves around very little. I'm really worried I caused/am causing him internal damage and I hate leaving him by himself, but I wont add more fish until the cycle has run its course.

Any advice? Will the one danio be enough to cycle my 29 gal tank fast enough that he won't suffer too much more until the ammonia and nitrate levels go to 0?
 
Strange the fish died so quickly. I wouldn't expect an ammonia spike 4 hours later with 3 fish in a 29 gallon. I would be suspicious of contamination.

With a fish in cycle it is important to keep the ammonia below 0.25ppm for the health of your fish. Which can mean large water changes. Maybe give your filter a clean in dechlorinated water incase its full of rotten stuff.
 
Well... I was going to try to correct my spelling, but it seems I really have been testing the nitrates instead of nitrites... I have no clue what my nitrite level is at. This is the first time I have ever lost fish while cycling, so now I can see why fish-in cycling sucks. I also forgot to mention I added plants to my tank before I got the fish hoping it would make the process easier on them, but I don't think they are doing anything.

Strange the fish died so quickly. I wouldn't expect an ammonia spike 4 hours later with 3 fish in a 29 gallon. I would be suspicious of contamination.

With a fish in cycle it is important to keep the ammonia below 0.25ppm for the health of your fish. Which can mean large water changes. Maybe give your filter a clean in dechlorinated water incase its full of rotten stuff.

What kind of contamination should I worry about and how could I correct it?
 
What did you clean the tank with? What substrate are you using? Are all of your ornaments aquarium safe?

I was in the same situation as you. Lost all my fish after 6 hours. My ammonia was zero. I eventually had to change everthing in the tank. I think it was the gravel I was using, even though it was mean't to be for aquariums.

If your ammonia was high at the time of fish loss that probably is the only cause. As kiss has suggested follow his fish in cycle link. You might want to bring that last fish back to the LFS and do a fishless cycle. A lot easier and you can stock the majority of your tank in one go. Kiss has link for that as well in his sig.

Good luck :)
 
Sorry for posting this so late, but I just thought to let you guys know what happened to my last remaining zebra danio.... I had been planning on taking him back to the LFS as Xraymark had suggested, and on Wednesday afternoon I came home from work to find a dead wasp in my tank, the fish was dead, floating around the wasp... The fish had actually seemed to be ok after I had gotten the ammonia level to below .25ppm and he had been swimming around my tank the last time I saw him alive. I can't say if the wasp was a coincidence, because I have never heard of a wasp killing a fish, yet my ammonia level was still under .25 when I tested it. The whole thing is just frustrating as I was about to save the life of the poor thing (from my newbie-fish keeping anyway...).

Anyway...Thanks for answering my questions, I'll definitely be doing fishless cycle from now on!
 

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