Healdsburg is a two year old pico (less than 5 gallon) reef tank named after the small town of Healdsburg, California. Originally started as a quarantine tank, later re-purposed as full blown reef tank, this tank mostly house various zoanthids corals commonly called as “zoa garden”. Other than zoanthids and palythoas, it also houses a ricordia mushroom coral. This tank does not house any fish or invertebrates.
Check out nano reef build thread of healdsburg for its detailed month by month history with photos.