I'm still new... only having tanks a year, but I would do water changes to dilute the noxious chemicals. I have used BioSpira to help with that although now that your chemicals are already up it may take longer to work. But if you can get some at an LFS I would suggest that to help get that bacteria working. I'm surprised though if you used everything from an exsiting tank that it would go nuts. It may be a mini cycle from a new set up. Maybe someone with more experience can shed more light... but off the bat do water changes for the crew's sake.