First of all, if you are quarantine fish, you don't have to worry about nitrate. Fish can tolerate a very high level of nitrate. You only need to worry about ammonia. There are a few ways to deal with ammonia in QT. Some people use a hang on filter, like aquaclear, with sponges. You can prepare the sponges by putting them in DT a few weeks before to "seed" them with bacteria. The second method is using some ammonia binding agents like prime. Don't use prime or any ammonia binding agents if you are using copper. The next method is a lot of water change. Most QT are small so frequent water changes are possible. No need UV or skimmer.
Basic equipments for a QT: small tank, hang on filter (optional), heater, power head, air pump (optional), PVC pipes for fish to hide (optional), seachem ammonia badge.
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