You should look at a quarantine tank that is 25% of the size of your tank that the fish will end up in. A 10 gallon tank should be good enough for a main tank that is 40 gallons or smaller. I have a 29 gallon for my 125 gallon main tank. It is just under the 25% rule. Larger fish should be kept in larger tanks, so the size of the quarantine tank should go up with it. What is the size of your main tank? If you are putting in smaller fish to start with (least aggressive/smaller fish should be added first to a new setup), the 10 gallon should be fine.
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