Reef safe paint?

[ScubaSteve]

+1 on Krylon. Good stuff.

[Nizzmo]

I have a blue tux urchin...

[sphelps]

Originally Posted by Nizzmo

I have a blue tux urchin...

It will remove the paint, a purple primer may be a better option either by itself or applied before paint so when paint is removed by the urchin you'll have a dark purple backing rather than straight white. Coraline will grow on it anyway so the primer will blend in nicely.

[mikeclarke]

You could put live rock epoxy which is purple all over the pipe. I bet that the urchin wouldn't scratch it off but I don't have an urchin so I don't really know.