Just let your tank running without fish 90 days. Remember quarantine your new fishes carefully.
You need some medicine on hand for quarantining: Formalin MS, Prazipro, Ick Shield powder.
For new fish, I often dip in Formalin in 50 min, then do tank transfer method (TTM). Dose Prazipro on 1st and 3rd round. Finally, dip in Seachem Paraguard in 1 hour.
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Best of luck