Hello KrisReef,
First of all I'm surprised and really happy to read so many "welcome" here, this is amazing :)
The tank has been up and running since January this year so it's still new. Like a lot of people with dinos issues, I let my NO3 & PO4 get too close to zero. The tank was fine, corals were good so I thought to myself 'hey, why test for NO3 & PO4 on a regular basis?' When dinos decided to show their ugly face, I tested NO3 & PO4 only to find I had zero of both... Now trying to bring levels up, experimenting with different things... This is part of the learning process I assume :)