cycling with dead fish

latazyo

Grisled
Sep 17, 2002
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I tried to move an established tank to a new area and unfortunately I was not able to save enough of the old water/filter media and the fish died. Can I leave these dead fish in the new tank to start a cycle? There are no other living fish in the tank.
 
As long as it was bad water quality that killed them why not? I'll answer for the nattering nabobs of negativity as well. You could introduce disease in the new tank! Ito it's just not worth it!
 
although the cories were in poor water conditions before, they outwardly appeared to be in perfect condition and were quite mature (5-6 years old)

while setting up the new tank, the fish were in ziploc's for about 10 hours...this was a really stupid mistake that I made and they weren't acclimated properly and were not able to adjust to a 99.99% water change
 
Thanks guys...I pulled the dead fish and am going to use fish food for the cycle

I'm 99% certain that the cycle was lost because I did a 100% water change, replaced all of the gravel and installed a new filter
 
So do you still have some of the filter media left, or did you toss it? If you still have it then use it as a seed for the colony. Otherwise you certainly can use fish food but I'd probably just find some pure ammonia at your hardware store instead. Much easier to measure out a sufficient dose since usually people recommend dosing 3-5 ppm NH3. That's a lot of fish food.
 
Personally, I don't think it's a bad idea. People sometimes use pieces of white fish or even shrimp/prawns to cycle their tanks so I don't see any reason why not to cycle with the fish that have passed.

Plus, it's going to take anywhere from 3-6 weeks to cycle the tank so you can raise the temp to 90 degrees Fahrenheit or a little higher during this time and that will kill any Ich parasites.

Just make sure to find the skeletons afterward so it doesn't cause any issue with your filter propulsion.

EDIT: Okay, I should have read the rest of the comments. I always use fish flakes to cycle my tank. In fact I don't even put the flakes in the tank itself for the filter to suck some of it up, I place the flakes directly into the filter. It's much easier this way. After your water parameters are where they should be (Ammonia-0, Nitrite-0, Nitrate-approx. 20ppm) I would recommend placing another filter pad in with the old one for about 3 weeks and then remove the old one.
 
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