What is this bubble?

[newreefnick]

What is the largish bubble growing from its tip? Is it okay or normal? Also probably part of the unfortunate ugly phase but asking just in case. Tank has had 0 ammonia for nearly 8 weeks but was set up originally mid march with live rock and live sand. Only growing around this coral though.

 

[Shaddow_wolf169]

Gas coming from the sand bed pop it and dip your coral

 

[Tahoe61]

Euphyllia sometimes just form these bubble growths, no one knows why but they seem to be perfectly benign with no intervention warranted.
Cyano growing is normal, probably a lower flow area, you can manually remove it, wait for it to burn it's self out or use chemiclean (follow directions). Make sure nutrients are not contributing to the cyano growth.