I’ve seen that before in this DBTC colony. In my case at least they would just split and it’d go away. I have a picture of another colony doing the same thing. Although I’ve seen torches split without doing the bubble thing so I’m not sure
Yeah I started getting major cyano in my sand bed of my display when I had it running without the MP pumps because I didn’t have coral yet. I did some manual removal and turned the pumps on and it didn’t come back