should I be concerned?
 

My tank has been up and running for about a year now and everything seems to be ok, however my question is in the last week I seem to have an explosion of "seaweed" or "green algae" growing on my live rock all of a sudden, Is this normal or should I do something?
Bruce

What kind of lighting, and have you changed the bulbs lately? Have you measured your nutrients? Anything missing in the tank? I'd say ya, be a bit concerned. Not emergency stuff, but you want to get on top of this.

I also see you're looking for more rock. Have you added any new (used) rock lately?

no I haven't added any new rock since I started my tank

regular water changes will clear that right up

I have the standard t5 lights and the bulbs were replaced about 2 months ago. everything measures ok so thats why I little concerend

K, bulbs sound fine. "Measured ok" is how many PPM of NO3 and PO4?

Any livestock missing? It doesn't take much to raise phosphates in a tank.

what are your water parameters? Are your nitrates creeping up?

RO water? If so your filters might be in need of a change.