Green Algae on live rocks

[Manojkumar]

Hi..
I have biocube 32 gallon tank for more thank 1 year. For last few days it started growing green hair like thing and it's growing fast all over my live rocks.
Can I get rid of old rocks and add new live rocks with the fish still in the tank (clown & chromis) ?
Please help.

 

[EeyoreIsMySpiritAnimal]

Why would you break down your rocks??
Do you have actual LIVE rock you want to replace your current rock with? Like, it's in another SW aquarium right now and has an established biofilter? If not and you're asking if you can replace with new dry rock, you're likely to have problems (and the algae will probably cover the new rock just as fast).
Test your nitrates and phosphates. If you don't have coral, you can do a 3 day blackout. Since you already want to take the rock out, remove one at a time and scrub off the algae and/or spot treat with hydrogen peroxide.