The general consensus is to tear it down and clean it with 1cup bleach per gallon of water.

If it was you, would you want to sleep in a hotel room that had't been cleaned since the last guests? Probably not. I wouldn't even want to board my cats or dogs in a kennel that hadn't been cleaned and disinfected after the last pet's stay, and I definitely wouldn't want to risk my expensive frogs in a previously occupied vivarium.

Hopefully, it's not a huge tank and it won't take you long to clean the plants in a 5 to 10% bleach solution. After that, rebuild and it's YOUR work to be proud of.