well, yes, I suppose the tetra will be fine... just a suggestion.akapaul26 said:By using the filter from the other tank with the media it should only take less than a week and I should not have a large spike if any I think he will be ok plus I am going to fill it with 100% water from my 10 gallon when I do a water change. so really if you can even say it will go through a cycle you know.