Hey I just want to put this out there,
I’ve been battling dinos for a few weeks now and my fish look terrible. My nutrients bottomed out- everything else is goods My tank is 5 years old. I didn’t do a black out- I’ve been dosing phos/nitrate dr Tim’s and phytoplankton, grab carbon and in etc. Took a few weeks, the dinos are gone. BUT i also lost fish. I lost my fire fish as well, and a trigger and the rest do not look great. I also suspect your losses were oxygen related but I did want to add that it seems dinos can possibly affect fish health.