Q Light Controller+

I am using a controller and wish to have a function where qlc detects whether or not a fixture is active in that row. If a fixture in that row is active, I want to be able to tell another button this information and for it to start flashing or something similar. Ideally it would be flashing the same colour as the active fixture however that's asking for a lot lol.

Welcome to the forum.
If you use some Loopback magic, you can detect which fixture is on. (Explain 'that row'?) Which row?
'Tell another button' -> bind it to the loopback input. 'Strat flashing?' the button itself? Hmm ... We could use the 'if the scene is called elsewhere, the button get an orange border.
'flashing the same color of the active' -> no!

Could you tell us a bit more about your setup? Are you using external controllers? Right?