I'm no expert- I am a survivor!
I would say you need to keep your allies growing.
The concern with leaving lights on is that the dinos can overwhelm and kill the chaeto and ATS. In theory, if the only light is on the ATS and the flow there is fast and has a large air/water interface (the way a properly designed ATS should), then dinos should have s hard time holding on.
So I would continue dosing to keeping Alk, ca, mg up + feed the ATS and keep lights there on.
And get a UV
