What is this and is it good or bad?

[The Jester2]

I found a small patch of this stuff before I went away on vacation to Orlando. I come back and it's all over the rock in several places some areas 2 to 3 feet from the orig. location. Don't know what it is or if it's good or bad any help to identify it would be great. I hope the pictures are good enough.
Thanks

 

[muddskipper]

flatworms, theyre only bad in large numbers as they suck the O2 out at night but flatworm exit will take care of them with 3 doses a few days apart..

 

[TomD]

That is a lot. They are more harmful when they die because they release toxins. There is a lot of info about using Sailfert flatworm exit.

I have never done it but I would try and to siphon as many out as possible and gi slow with the exit, syphoning while they die.

Here is a link with some info:

http://www.melevsreef.com/flatworms.html

 

[muddskipper]

follow the directions that come with it and you should be ok.. I had a bleaching problem with some sps first time I used it but everything recovered nicely, I think I over used the charcoal after I did my water change and thats what might have caused the bleaching.. But make sure you use it several times to insure you get them all.. space it out, I did mine about a week apart each time. I still have a few in the sump but they havent been any prob. not really enough light there I think for them to get going again ( been about 4 months and no population explosion) but i do keep a watch on them..