What are these weird looking things?!

[Kit with Cat]

Thanks for the links and the advice so far! Really appreciate it!
I have just purchased a psychedelic mandarin...would that eat them? (I know its sorta like dependent on individual mandarin but I've only read that green mandarins will eat red planaria...is that true? Do I need to get a sixline wrasse?)
My reef tank setup:
running 8 months
90 Gallon
1 regal blue tang
2 false perculas
1 bicolor dottyback
1 psychedelic mandarin
1 blue spotted jawfish
1 diamond goby
2 cleaner shrimps
hermit crabs and snails, 1 x pompom crab, 1 x emerald crab 1 x tuxedo urchin

It just occured to me I have a refugium and that maybe where the red planaria are coming from? Should I get rid of it?
Thanks everyone!