Cleaner Clams!!

Ok , i have had a 10 gallon tank cycling for quite some time, and well.... i was wondering if i could buy a cleaner clam? do they need special lights? i have a sand bed (10 lbs). and will it be ok with a rock boring urchin?
I dont have any thing in it yet.
Any advice about hese creatures would be great. (Never Had A Clam before
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