Guessing you meant 549?
As long as you didn't let it dry out, because then whatever is there end up becoming hard and encrusted, and algae doesn't seem to like to re-grow off that (like when you "cook" your screen after losing a pump or forgetting to turn it on)
I think you're good to go. Start like new, 9-12 hours at 6 o'clock.
It remained moist and I meant post 573 as a comparison to how it looks now. Got it thanks a lot