Thank you for your question Hugo! No, not yet, most likely. First, you need to test the water for ammonia, nitrite, and nitrate to see where the new tank is in relation to the cycle. Even if it is completely cycled though, adding 13 fish all at once will cause a huge spike in ammonia so try to break them up into groups of 3 or 4, and add more bacteria with each addition of fish. A 20 gallon can comfortably house 10 fish of 2" each.
Date published: 2018-08-13