from the small pic i would say yes. i had these in my 40 br. i added more flow to the tank and feed less. they have pretty much disappeared. i'm not saying the same thing will work for you but it's something to think about.
i believe they began spreading when i was skimmerless(i was using the skimmer on my other tank for a while)
There are many really good ways of erradicating them - they are, however, only nuisance if you don't like they way they look and often the byproduct of overcrowding and overfeeding - not taking shots, just that the research shows that with good flow and strong skimming (along with some natural predation) the flatworms will wax and wane on thier own. Often they will wane and dissappear - dragonets and leopard wrasses are known to be natural predators for the flatworms (planaria).
Do a search on wetwebmedia for Planaria, and you'll find a host of info (no pun intended). most of which is outlined above.
House, I currently have a mandarin dragonet in the tank. However after research I think it may be more of a flow issue. They tend to like low flow and I need more flow. It is not an overcrowding issue or feeding issue. I only feed once a day or every other day and I have a much larger skimmer than my tank needs. I have a H&S 150-F2001 rated @ 225 gallons on a 90 gallon tank. I only have 5 small fish.