i need help bad

hi i have a saltwater tank its been up for like 2 months and the ammonia is the highist
and so is everythang elses it high as it can to what can i do for it to go down about 3 weeksago i had on fish in my tank and it was alive for 1 week the died my tank is 36 gl fish only should i do a 90 % water chang idk help thanks

Original post:
i need help bad

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