What's the best way to rid myself of GHA? It's not taking over yet but I don't wan to se that happen. How do I stop it quick?

What size tank do you have?

Reduce feeding to every 2 days, reduce lighting, lower nitrates, add chemipure or gfo.

Get a algae eating blenny, if your tank is big enough get a yellow tang to help eat it.

Would it be smart to remove the worst rocks and scrub them a bit?

Boiling will solve any of your problems. Just make sure you have a side container with good water flow running or something to cure your "dead" rock once its boiled.

Oh it's a biocube 14

To drastic at this point.

what CUC do you have currently.

reduceing feeding etc as stated earlier is the first step tho I think.
The algae would not grow if there was not excess nutrients etc.

Give us the run down tank age params stocking etc

Biocube 14 2 months old
mediarack w/ chemipure filter floss and chaeto intank lights. Oceanic skimmer mj900 return. Knano power head.
13# lr 2# ls
2 scarlet hermits 2 blues added 2 more yesterday 6 hermits total and one emerald
1 pepermint shrimp 1 skunk cleaner 1 tiger pistol
1 small false perce 1 small YWG 1 neon cleaner goby
2 turbo snails 2 sand sifter snails with tubes on them? And 2 other small snails
feeding small amounts 1 per day
water par.
Ph 8.05
amonia 0
nitrites 0
phosphates 0
nitrates .10
temp 78-80
weekly water change of 2 gal

more snails !

Which snails are the best for it?

Even if its small amounts of food a day, it is still more than a small amount of food every 2 days...

I don't know any snails that eat gha. I would look into a algae eating blenny and beef up your routine.

Also test your new made saltwater before adding to the tank and make sure you are not adding nitrates or phosphates.

Good luck!

Thanks