2 SPS questions

Alright, so one of my SPS (ORA Roscoe's Blue) has had that weird thing on it's base since pretty much the beginning, it hasn't gotten worse, but the coral did lose a lot of it's color since I got it 4-5 months ago (it's under T5 bulbs, bulbs are about 7 months old getting replaced soon)
Should I be worried about it ?



And here is a ORA yellow fuzzy that was given to me just recently, it looks like it has started bleaching ? It used to come out in the beginning, now I don't see much extension if at all, and the base is all that greenish white color .....

 

Yes they both don't look too happy.
What is your water parameters like.

 

That is algae growing on dead tissue of the Roscoe. Long dead.

STN on your yellow. Check your phosphate levels.

 

params as of yesterday:
Temp: 79.2
pH: 8.08
sg: 1.0257
Nitrite: 0
Ammonia: 0
Nitrate: 15
dKH: 7
Calcium: 400
Magnesium: 1480
Phosphate: 0
Copper: 0

 

It doubled in size since I noticed that dead tissue, how could it be dead ?

 

The dead tissue area has not gotten bigger has it?

SPS are a large group of organisms. If some die off, the rest can still thrive and grow.

 

yeah that dead tissue is actually a tiny little piece on the base, so I shouldn't worry about it then right ?

 

Don't worry about it. It died a while back and is now basically like live rock on that particular spot. The rest of your coral should continue to grow with no ill effects.

If you start to see more white spots or the algae starts spreading, then you have a problem.

 

OK cool.
I wonder though why it has lost color, it used to be a darker tan color with nice blue tips, now it is light tan with light blue tips.
would a supplement like Brightwell's Koralcolor help ?

 

It is more likely your aging bulbs. Acros do weird things sometimes. I had one recently that changed bacteria strains on me. Went totally brown for 2 months before reverting back to its normal green.