7 month old tank has sudden MAJOR ammonia spike?? HELP!?

Question:

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Answers:

Ammonia spikes are completely normally after introducing a new fish into a tank. You can buy some ammonia chips or a liquid "ammonia remover" to help your fish through the cleaning process. These "ammonia removing" products don't actually remove ammonia. You'll have to do that yourself via a clean filter and daily water changes until it goes down. But, the ammonia products help keep the ammonia from being toxic in your tank.

do a water change and keep an eye on it... and be sure to move him to a larger tank.

Sounds like you're relying on your filter too much. You should be doing weekly maintenance on the tank. Water, filter, substrate etc.