'Mad Money Lightning Round': Stay Away From Potash

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NEW YORK (TheStreet) -- Here's what Jim Cramer had to say about some of the stocks that callers offered up during the "Mad Money Lightning Round" Monday evening.

Potash (POT): "What do you do when the fundamentals are bad and the stock goes up anyway? The efficient market is not efficient and I don't understand why."

Knight Trading Group (NITE): "I want the CEO back on the show. That stock has been tanking and I am concerned. I'm saying don't buy until we find out what happened here."

Companhia Paranaense de Energia (ELP): "This has been another hot one. I never want to keep people out of Latin America. I like CPFL Energia (CPL) though, it's got a better yield."

China Fire & Security Group (CFSG): "Very tough call. It's a small company. Every time I go down this path I hurt people, so I'm saying don't buy. "

Aracruz Celulose (ARA): "I was going to send you to International Paper (IP) but it's at a 52-week high. I think this is a good one. "

-- Written by Scott Rutt in Washington

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At the time of publication, Cramer was was not long any stock.

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