Because the fish may need multiple applications of the Tricide Neo, mix 1/4 of the packet with 1 quart of distilled water, and put that in a spray bottle. When time to treat, lift the fish out of the water, and away from the tank, and spray all wounds with the mix multiple sprays keeping it wet for the time specified on the packet. Rinse the fish with fresh water and return to the tank. Tricide Neo is very strong and will kill filters, so the need to rinse fish. The other 3/4 of the packet, place in a plastic bag, and freeze to preserve it, so that you can mix additional as needed. The mix must be refrigerated between uses. The instructions reference a bath, but the fish soaking in the bath, requires a fairly large amount of mix, fouls the mix, so that filtering through a coffee filter is needed between uses, and refrigeration and subsequent heating to tank temperature before use.
You will probably want some clove oil to put the fish to sleep during treatments for ease of handling, as ICU2 noted above.
Zone 7 A/B
Keep your words sweet. You never know when you may have to eat them.
Richard