Join Date: Mar 2013
Location: Montgomery Village (back to NYC soon!)
if you seed a tank with bio-media from an existing tank, but there is nothing for it to feed on (no NH4 or N02) as there is no bio-load, then the tank won't cycle. At least some type of ammonia source is needed. While the tetras were a poor choice given tank size, they at least ensure the cycle continues. I do agree that the tank may be a little small for the fish.
Seeding a tank will still cause a cycle; the only difference is that it is going to be expedited with the introduction of seeded media.