how to gently break rock?

[Oxymoron]

Maybe with a tool such as a dremel you could notch out the area you want.

[Pazil]

If you can remove the rock from the tank...... just use a hammer

[xtreme]

Maybe you could trap it? I'm not sure what you would wanna use for bait though. At least this way you wouldn't have to break up your rock.

[PuffLuv]

I haven't tried it, but I would consider lightly drilling it, possibly with a small masonry drill bit.

[StirCrazy]

hack saw.. works good and it cuts fast.

Steve

[banditpowdercoat]

I use a slot screwdriver with hammer. A couple light taps on the screwdriver, and splits rock nicely

[hillegom]

I have heard of people pouring soda water into the worm's hole and he just pops out.

[muck]

HULK SMASH!!!
Then just place the pieces back in the tank sans worm.

[golf nut]

Originally Posted by hillegom

I have heard of people pouring soda water into the worm's hole and he just pops out.

They like soda that much?

[Navarchus]

Originally Posted by banditpowdercoat

I use a slot screwdriver with hammer. A couple light taps on the screwdriver, and splits rock nicely

The best way IOM