Dirty spots on leopoldi

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Is it wild caught or captive bred? Size? Either way I have seen some with what is called dirty spotting. ie: spots with brownish or yellowish tint. More so with WC though.
 
I have always wondered what this was from too... I see many leos with dirty spots but none of mine have this... All mine are cb though


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He is captive bred, and the colour is dark grey just like a spray gun splatter in the spot. I would like to know if its some thing that i can prevent from happening or not?
 
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