Add lots of plants, they directly take up NH4, adding CO2 amplifies the uptake of NH4 by about 5-10X, also amplifies algae growth as well
Add Zeolite, removes the NH4 and acts as biomedia ater after about 1 month, the same time it takes to cycle.
Do 2-3x a week 50+% water changes for the first month. ADA suggest this, so does Jeff Senske and so do I.
Add mulm, that flithy brown soupy stuff from the filter sponge, or from a deep vacuuming. This adds precisely and instantly what is missing from an estblished tank.
If you use ll 4 items, you will never have any issues.
Regards,
Tom Barr