I'm new to mead making; this is my second batch. My first batch went over well, beyond my slight lack of patience (not wanting to bulk age for as long as I could/should have). This time I wanted to try something more adventurous, but now I am worried I'm sitting on a few gallons of potential yuck. I made a basic mead that I pitched with Red Star Cote des Blancs, and let sit for 48 hours to start fermenting. Then I added a bunch of herbs and such (hibiscus, rose petal, vervain, marshmallow root, mugwort, raspberry leaf) in a little cheese cloth tube I made. I let that sit for a week and stew before taking it out. Then, after about 3 more weeks once the main fermentation activity was over I re-racked. At this point everything was looking good and normal as far as I could tell. Now it has been just over another week and there is a formation on the top. It looks really yeasty (like when making yeast active from packets for bread), but also looks kinda green colored compared to yeasty colors. I don't know if that is just because the color of the mead being pink (from the flowers) or what. So, can somebody with more experience than I confirm if this is normal yeast activity (this didn't happen before with the other yeast I used on my first batch), or if you think it is some nefarious growth I need to deal with? I wasn't sure if the yeast should be making formations like that since it isn't really fermenting anymore and most if it is dropping out. And yes I sanitized everything.
https://goo.gl/photos/cdr18Gn723WepsfKA
https://goo.gl/photos/cdr18Gn723WepsfKA