help help help!!

Hi i have a brown cob-web like substance all over my live rock.
It looks like a sort of algae but not sure??
the tank is clean and phosphate free and
all my other parametres look good.
all fish healthy.

It looks like spores??
Thats the only way i can describe it.

Anyone any idea what it is and any advice??

 

We are going to need a picture.

 

A picture would be very helpful, as would more information. If you fill out the ASAP parameters page (pasted below), I'm sure someone here can help you (and even more so with a pic).

Brief description of the problem.
A picture(s) will also help.
PARAMETERS (important)
Temperature:
PH:
Ammonia:
Nitrite:
Nitrate:
Salinity:
dKH/KH/Alkalinity:
Magnesium:
Calcium:
Phosphate:
Test kits you own:
Liquid or Strips:
Brand Name:
Are they Expired?:


Tank size?
Estimated total system?

Reef, fish only or, freshwater?

Current inhabitants? What and how many?
Clean up crew?

How long has your tank been set-up?

Substrate.
Type?
Depth?

Live rock?
How much?
Did you recently add some?

Filtration.
Type?
Protein skimmer?
Do you wet or dry skim?
Maintenance schedule for filtration?
Drilled tank/hang on back overflow?
Sump/refugium. What's in it and how much?
Macro? What kind?

Lighting.
Lighting type?
Age of bulbs?

Feeding
What?
How much?
How often?

Water change schedule.
How much?
How often?
What salt brand?
Water source?

Additives/supplements used?

Do you have a ground probe?
What kind of flow does your tank have?

Any additional info you would like to share.... Including anything different that you have done/not done.