Need to trap a lobster!

Alright..I'll start off by saying I know lobsters are not reef safe, I did not know this when I purchased it back in January. I thought this thing was dead since I didn't see it when I did my tank changeover (must have been wedged in a rock somewhere). Well I traded my clarkii last saturday for a small false perc that disappeared 2 days ago. I moved some rock around last night and found a shell where it had molted, hmmm! I think it ate my false perc. Today I can see it in through the rockwork perched like it's waiting to snag something. How dod I trap this ^&@&#$ ?
 
I would probably pull the rockwork out where it is located, after putting some acrylic here and there to prevent its escape to the rest of the tank.
 
Well..I knew that would be the answer but was hoping for another option. It's only a 58G so I guess I'll pull all the rock out when I do my next water change and get it, I know it's tricks now. I can pull the 6-line out at the same time, if that lobster grabs my mandarin I will declare war.

Cheers!
 
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