[Pleco fin curling?]

I just noticed the right fin on my beloved flash pleco has a little kink in it all of a sudden. I don’t think he could have hurt it on anything in the tank. Any ideas on what could be going on? Thanks guys!

btw: thats not ich or anything on him for those who may be concerned. flash plecos have spiky little hairs all over their bodies. 

 

[What are these tiny creatures?]

https://kapwi.ng/c/oC12JeWa 

Hey guys! I have about a two month old shrimp tank and have been noticing these little guys on the glass. There seems to be at least two different kinds. Any idea what they are? Can they be harmful to shrimp or fish? Do I need to eradicate them? Thanks!

(sorry about the background noise and my finger in the video)