A filter sock won't provide enough bacteria to cycle a qt, there is not enough surface area for bacteria and also presumably you wash them fairly regularly which will kill everything. the best thing you can do is see if your lfs has any seeded filter sponges on hand that they keep in their system. Mine do and sell them for emergencys such as yours, you can then add them into an internal filter. failing that you could also add a bottled bacteria product but be aware you will always get some ammonia buildup with these (others may disagree but I have used several brands to 'instantly cycle' qt tanks and despite their claims have registered ammonia with all of them). Get yourself an ammonia alert badge and test ammonia and pH in the hospital tank daily, also make sure you have enough water on hand for multiple water changes should you need to reduce ammonia, you can use ammonia detoxifiers such as prime or amquel but not if you are using any medication. what is the actual problem, disease??
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