It obviously looks beige to yellowish in color, but that may just be the camera shot, but is this a transparent white to the eye? Does it swim like a jelly fish? It has the shape of a common flat worm that was ID'ed on wetwebmedia.com. I have read they eat pods and such.
Fill us in on more info.
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30g reef tank, CPR CY192 filter w/ DIY plumb running Rio 17HF return, Coralife 3x 9w UV Sterilizer, 3 24W T5-Helios 10K Daylights/3 24W T5-Helios Blue lights, 2 Logysis blue meteor light strobes (moonlights/24 Blue LEDs).
Tiger tail cuke, asst. snails/hermits, asst. feathers, rainbow acan,zoos,shrooms,bubble,galaxea, asst. shrimp, 2 ocellaris,mandarin,zebrasoma xanthurum,pink-spot watchman,red-striped pistol. | 
Isopod ID? 
