This Old Spouse
TOTM Winner May 2013
You can use any kind of treat, or just skip it altogether. I just went through all this with 9 tiger barbs that I just got. I put them in a 10g quarantine tank, and the first couple of water changes they were pretty scared. But now they're used to it and actually play in the bubbles when I put the fresh water in it!
If the 4 fish you're putting in a 5g tank are small and will stay small, you should be fine, especially with daily water changes for a week or so to let the filter media catch up to the bioload.
If the 4 fish you're putting in a 5g tank are small and will stay small, you should be fine, especially with daily water changes for a week or so to let the filter media catch up to the bioload.