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They can be quite colorful too!
http://m.liveaquaria.com/product/prod_display.cfm?c=15+46+358&pcatid=358
The spiny crablike legs are a modifcation to their spine, and the side fins are only used to scare off predators. Why is this posted in predatory fish? You guessed it! It will swallow pretty much anything that fits into its mouth, and, HINT, it has a BIG mouth.
Now... To go about acquiring the blue finned ones...