Can anyone help identify

[Charlie G]

Hi. I just noticed this on my rock as well. Seems new. Seems like it's whitening out. Tank is 11 months old. It's a 32 g Biocube and I did a large water change last night (about 10 g). Been dealing with GHA. Any advice is appreciated.
The only other thing I did with my water change was to suction out the second chamber in the back which seemed full of detritus and removed some bioballs I had in there.
I also purchased and placed a blue tuxedo urchin 3 days ago.

 

[Rick's Reviews]

Yes pics are rubbish.
but if you can highlight what you need to identify it would be a great help

 

[Chee-tomorpha]

It's the urchin. It's scraping everything off the rocks and will include coralline algae. I've got one at work in my tank as well. Does the same thing. Cleaned the tops off real nice.

 

[Charlie G]

Yes pics are rubbish.
but if you can highlight what you need to identify it would be a great help

Sorry about that. Camera not picking up well what I am seeing. I am resending whatever pics I have with a circle around the rock in question. It seems bleached.

Maybe nothing to worry about. My newly placed urchin may have travelled over but not sure if it can do that. I never had an urchin.

 

[Charlie G]

It's the urchin. It's scraping everything off the rocks and will include coralline algae. I've got one at work in my tank as well. Does the same thing. Cleaned the tops off real nice.

Oh ok. So not a bad thing?
That's impressive. I am hoping he cleans up my gha.
Any downside to him scraping the rock?
This is my first urchin.

 

[Chee-tomorpha]

It's my first time with them too. If you don't care for coralline they are great and keep surfaces clean.

I'm not sure what exactly they will eat, if they eat GHA or not. I'll let more experienced help answer that one.

I have a purple tip pin cushion urchin and it seems to be avoiding all the large fibrous algae I'm having issues with. It does a great job with the green film and moss like algae on my rocks. It has issues getting into crevices though.

 

[Charlie G]

It's my first time with them too. If you don't care for coralline they are great and keep surfaces clean.

I'm not sure what exactly they will eat, if they eat GHA or not. I'll let more experienced help answer that one.

I have a purple tip pin cushion urchin and it seems to be avoiding all the large fibrous algae I'm having issues with. It does a great job with the green film and moss like algae on my rocks. It has issues getting into crevices though.

I kind of like the corraline but I hate gha more. Not sure how effective he is yet with the gha. Will let you know.