They look like Splendid Garden Eels, Gorgasia preclara. They're not quite as common on display as Heteroconger hassi (the other species shown) but they can't be too far behind. Nice things.
What I'd like to know is, what is the third species?
The 3rd species is Gorgasia maculata, a species not yet known by zootierliste and there is also no sign for this species in the aquarium, but the animal inventory of this year lists them fortunately .