fermentation slowing after 5 days, odd bubbles on top of fermenter

Ahoy,

I brewed this beer five days ago, everything appeared to be going well. I had an original gravity of 1065 and pitched the yeast at 65, SAF 05. It fermented well staying around 65-70 for five days now, but today I noticed the kraeusen had really dropped off. I was looking and noticed these large bubbles in the center of the fermenter this evening. Should I be concerned?

I was going to rack this beer to secondary on Sunday which would be 7 days, of course after a gravity reading. Should I be concerned about these bubbles?

Looks totally normal, don't worry, co2 tends to escape at some point.