Just picked up some liverock

and jesus the difference is crazy... the rock i got is so clean and awesome looking. But my rock is all covered in green algae. Can i take some water from my tank put it in a bucket and scrub the rock till somewhat cleaner? would i hurt the coraline algae thats already on it? here are some pic's

The first 2 rocks are the new fiji and the other 2 are from my tank...LOOK at the difference.

 

Scrub away, you may kill some coraline but it will regrow. This is one of the reasons I prefer base rock verse live rock.

 

Do you have a clean-up crew? How long has your tank been running? What is your light cycle?

 

I have a trigger tank. snails, hermits they dont last a week. Tank been up for almost 5 months its a 55 gallon 75 ibs of liverock T5 lighting of about 6 hours of lighting a day.

 

Sounds like it is going through another cycle to be honest. You could either let it all cycle through or
1) slowly remove the rock (maybe 5-10 lbs at a time)
2) scrub it with an unused scrub brush
3) place it back in the tank
4) wait about 5 days for bacteria to grow on the rock again
5) repeat till all rock is clean

 

High silicates causing the algae?