MTiffany, those are excellent suggestions!
I really should have listed them in the first place. I am always looking at reference articles online when explaining cycling to beginning aquarists, or even when I need a refresher myself! It would be a good investment to grab a high school chemistry book.
Also, I bought myself an old gram scale (originally used for jewelry) at a thrift store a while back when I needed to weigh praziquantel for my fish. It is definitely a great tool to have on hand!
Bazil, I'm not sure about your experience with clove oil, but I recommend it precisely because it is difficult to overdose. It's an extremely safe sedative and when used properly, an extremely effective product for euthanasia . Finquel, or MS-222, as most veterinarians know it, is harder to obtain for the average aquarist and it is easier to overdose with this med. One huge advantage to clove oil, or eugenol, is that there is an inverse relationship with dosage and sedation time. For example, even with a very strong solution, if the fish is moved to fresh water in a short amount of time, it can be revived. With a lower dose, the fish can be safely sedated for much longer before there is any danger. If Finquel is the only med available, there is no reason to go searching for clove oil, since they are both excellent chemicals for anaesthesia. But I don't think it is inherently safer than clove oil.
Keep in mind that goldfish and puffers have different reactions to the same chemicals. The recommended dosage for sedating goldfish is no more than 5 drops per gallon.