Hair algea :(:(

[Coral Hoarder]

So I have a masive hair algea problem here's some stats
30 galon tank skimmed sps Lps softies zoas

2 clowns halk fish 1cardinal 1 dotty back
4 bulbs t5 3 blue one blue plus
Skimmer and a huge refugee is the filter as well as a bunch of rock

I do 50%weekly water changes with ro water

I think the rock is causing it I didn't do an acid bath

What should I do.

My options right now are keep battling it manual removal and urchins or

Take all the rock out acid bath it and then let it cycle and add it back?

If I was going to do an acid bath what would I have to do step by step?