Ruth,
Don't know if I got them all, but while re-aquascaping my 37g a couple of weeks ago, I found lots of little groups of these hydroids. They grew mostly in crevices in the rock, and mostly on one rock, though there were a few groups of them on other rocks as well.
I used a heavy duty wire cutter to cut out the rock surrounding the hydorids. It took forever to cut around them and then to finally get to the base of them and cut them out. I also used tweezers to remove any chips of rock that did not automatically fall off the rock as a means of making sure I did not recontaminate the rock with stray hydroids I'd already cut.
I'm pretty confident this method worked on the hydroid groupings I found, but my fear is that I didn't get them all. Took over an hour to do about 25-30 lbs of rock from that tank.
Have not seen them in any of my other two tanks, but am particularly concerned that they may also be in my 67g as the 37g and 67g both have some rock from the same shipment.
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