What is growing on my live rock?

[captainmj]

Last night I noticed something unusual on my live rock, just one, a completely round black shiny thing? Have not a clue, was not moving or anything it is 3/8" truly completely round and very shiny......any ideas? Can not get a clear pic, to small.

 

[bang guy]

Is it a very dark green? Your description sounds like Valonia to me (Bubble Algae).

 

[captainmj]

Bang Guy, could be looked black to me but could be very dark green due to lighting in the tank, I am running a Power Glo 40 watt.

 

[captainmj]

Will this bubble algae hurt anything, what do I do about it if so?

 

[sufunk]

It will pop and release a bunch of spores. Not a huge deal but get it out if you can. Just gently remove it so it doesnt pop.

 

[captainmj]

Thanks I will give that a try this evening.