Can try either way. The rule that we sit back and allow total takeover at the start is a bunk rule people made up to justify not tending to their lawns
Removing any bad growths does not harm, and the system isn't benefited by leaving in cyano and gha in February as they'll seed the tank for future headaches. The diatoms are easy to manage and are likely to self resolve. Once you see any invasion taking over, simply force it out via deep cleaning and not additives, work like a lawn physical guidance is where reef control is at
Light diatoms coverage is expected and no big deal at all
The cycle can never be undone by sandbed cleaning, full water changes, or taking rocks out of the tank to scrape things off for a little while. Handy for February algae challenge coming up