Algae ID help

Hi, I'm hoping you can help me ID this algae. My tank is only 3 months old (cycled, zero ammonia and nitrite). Any suggestions for treatment options would be welcome.

Thanks!
 
I checked my nitrate and it was >40. I've started doing water changes to bring it back down slowly. 30% every other day. I've also turned up the light hrs on my fuge and removed the organism from the rocks. It came off really easily and fell apart as I did it.
 
Yes they are. Soft and slimy with a reddish brown tint. I have my nitrates under control now (I found lots of detritus in the back chamber, drastically reduced feeding) and I added a wavemaker to increase flow so it is getting under control :)
 
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