New tank set up using 'shrimp' method/existing filter media

robertwdc

Registered Member
Mar 11, 2006
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Alexandria, VA
Hello! I was wondering if I could as the experts a question?

I currently have a thriving 26 gallon tank, and after 6 months, decided to upgrade to a slightly larger tank. Since I live in a small place, I decided on a 40 gallon.

I set up the new tank to begin the cycling. I decided to immediately move my existing filter (Eheim 2213) to the new tank since that will be it's new home, and in hopes of helping the cycling process with the bacteria colonies in the filter media. I also placed a plant and a small rock from the old tank as well. Within a day, I was registering 30 ppm nitrates.

I wanted to go the route of the fishless cycling since I hate the thought of loosing fish through that process, so I'm going the 'cooked shrimp' method. I placed 3 cooked shrimp in, and within a day, my ammonia level shot up.

The next day, my ammonia registered 2.0 with nitrates still at 30 and nitrites at 0.3.

Day two, my ammonia level dropped to 1.5 with nitrates still at 30 and nitrites at 0.3.

Day three, my ammonia levels are at '0' and again my nitrates are at 30 and nitrites at 0.3.

My two questions.

1. This may be stupid, are those 3 shrimp I put in enough for the entire cycling stage, or do I need to replace them at any point?
2. This process is not proceeding at all like my first tank when it cycled. My first tank went through about a 3 week cycle stage, and it was a couple weeks before my ammonia levels fell. This situation seems strange that the ammonia dropped off after 3 days. Could the bacteria colonies which were in the filter media, plant and rock caused this tank to jump into super cycle or am I going to see nitrites and ammonia rise in the near future? My tank has been up and running less than a week, with an ammonia spike and now it's down to '0'. Seems like something is not right.

Sorry to ask this...I just have never used this method before, (existing filter media and shrimp) so I thought I would ask.

Thank you for your time!
Robert
 
Cycling is the establishment of beneficial bacteria that help with processing waste products the occur via natural processes in the aquarium.

The bacteria establish themselves: in the filter, in the gravel, and on any decorations.

Having said that, if you moved your old filter to the new one and are not increasing the bioload on the new tank, then it is already cycled. The shrimp probably produced more waste than your current fishload does, which is why your readings shot up. Take the shrimp out, do water changes to get the readings back to 0 and put the fish in already :)

The reason your old tank took three weeks is because there were no bacteria present at all. Your new tank has all the bacteria it needs.

HTH
Roan
 
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