I have a 10 gallon healthy established aquarium, which houses 1 8inch jack dempsey. I know thats WAY too small, I had a tank break early this year and the 10 gallon was to be used temporarily for him, but that turned into about 4 months. It has a filter on the 10 gallon that is made for a 50+ gallon tank (the one that broke) which has helped keep water quality ok. Anyway, I am finally able to buy a new 55 tank this weekend for him, but I dont want to cycle. Takes too long and I dont want to have to buy fish and wait weeks (bring on the "than you shouldnt keep fish" comments). I plan on emptying the entire contents of the 10 gallon tank (gravel, water, cave, decoration and the entire filter) into to new 55 tank to transfer over the bacteria. My question is will this be enough to establish good bacteria in the new tank? If not should I add some of the bottled bacteria that is available?
) and have a filter with x-number of bacteria on it to consume that ammonia, turning it into nitrites, then finally nitrates. The bacteria on the filter can only grow as much as there is food available ( food for bacteria is that ammonia/nitrites I mentioned ). So, if you're not adding any fish right away, you already have the necessary bacteria on your filter. If you decide to add another fish ( say a mate ) you will likely see spikes in ammonia ( if you test ) until the bacteria on your filter has grown to accomodate. Another thing to keep in mind is surface area. The more the better. If I were you, I'd also buy a second filter for the 55. But that's just me. Good luck with the transfer!