UFO in my Marine Aquarium

Question
I have a 40 gallon reef set-up that is approximately 8 weeks old. Over the last 2 weeks several, now 100's, of small white objects have appeared on the glass. They seem to be living, moving very little. They are present 24 hours a day. What could they be? Should I be concerned? How do I eliminate them with out causing harm to my system?

Additional data:
Hardware...
40 gallon marine aquarium
260 watts compact lighting blue and white
Eheim 2213 canister filter
EcoSystem 60 Refugium
240 watt heater/chiller
9 watt sterilizer
402 powerhead

Livestock...
60-70 lbs. live rock
25-30 lbs. live sand
brain corals
star polyps
button polyps
blue, grenn and red mushrooms
bullseye mushrooms
frogspawns
tube coral
camel shrimp
red foot moon snails
Scarlet Reef Hermit Crabs
Turbo Snails
Margarita Snails
Dwarf Red Tip Hermit
Electric blue hermit

Answer
Ken,
You are seeing a variety of flatworm in your tank.  These are not uncommon at all in reef aquariums.  Treat them just like a zooplankton... some species of fish (especially mandarins) and inverts will eat them.

If you notice way too many of them for your liking a simple algae cleaning and a water change generally will knock the population back a bit.

Best of luck with your aquarium!

Regards,
Scott Johnson
Aquarium Crazy Fish
www.aquariumcrazyfish.com