Bubbles and Purple Stuff?

[zip207]

I have a few areas that have purple stuff that if brushed away returns in one day. The purple stuff also typically has bubbles on & underneath it. Is this a sign of low flow or is it something else?

I have more power heads that can be pointed in that area but it seems to always make a piece of coral unhappy to have a new flow pattern.

Any help would be greatly appreciated.

Thanks!

[Toddmonster261]

Coralline Algae?

http://en.wikipedia.org/wiki/Coralline_algae

[Sk8r]

Cyanobacteria, a common problem as tanks mature.
Go to the how-to sticky above and look up cyano. That will tell you how to fix it.

[xCry0x]

I remember cyano as being one of those things I spent a lot of time trying to get rid of when my tank was super new and then it magically just fixed itself with time. I like to pretend that the 48 hour no lights, carbon dosing, whatever else was cool to do helped.. but pretty sure the tank maturing is what actually did anything.

[zip207]

Thank you both for your help. The tank is fairly new so hopefully it does resolve permanently over time. I ended up doing a mini-water change and siphoning out what I could find.