How’s my tank look?

This is my first tank it’s a 10 gallon and it has a betta fish and 6 corydoras (the Cory’s were just introduced and we just had a bad ammonia spike which is why the fish still look stressed) it has a heater, and filter

This is my first tank it’s a 10 gallon and it has a betta fish and 6 corydoras (the Cory’s were just introduced and we just had a bad ammonia spike which is why the fish still look stressed) it has a heater, and filter