Whenever I see a crab in my tanks, that I know is carnivorous, I quash them, but I also found a porcelain crab in my 75 which was a sweet bonus! Dont quash em all!
Changing rocks, well, I do it every once in awhile because I dont like the rock structure. Nothing ever happens when I do it to the fish or corals, the only time I ever had a problem was my elegance coral died on me but for the past 2 years the ones comming in havent been fairing so well in captivity.
Chris
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No more tanks  - Laying off the ReefCrack for awhile!
Cheers,
Chris
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