FYI: Bristletail Filefish eats colonial hydroids

[Leah]

If only you could spray paint them with some color

[whatcaneyedo]

Thats great to know. I had a good friend get out of the hobby after his tank became overrun with hydroids... At one point in his battle he blow torched all of his rock trying to kill them off.

[mark]

not to hijack, but at one time seemed my rock was covered in hydroids. Tried pulling them out but didn't help so just left alone, now need to look really close to find any. Thinking one of the phases like diatoms.