Empty tank with old filter. Keep cycled with ammonia?

[k7prz]

I've got a 29 gal tank with water and Aquaclear running but no fish in it. Before adding discus
I need to make sure it's cycled. Should I drop in a little NH3 to keep it cycled?
I have not bought the 3 discus yet as I won't be back home until after the
solar eclipse trip. I figure an empty tank won't feed the biomass in the filter.
Not sure I want to use other fish to keep it cycled. Would a couple drops
of ammonia per day work?

[Discus Fever]

Instead of ammonia for the time you are gone you can put fish food in the tank and leave it, this will do the same thing.