NL100, howto maximize hidden quads

[Smart Money]

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Preflop: UTG+1 opens for $10, UTG+2 calls, I call with 4 [img]/images/graemlins/diamond.gif[/img]5 [img]/images/graemlins/diamond.gif[/img]. CO raises to $30, UTG+1 calls, UTG+2 calls, I call

My initial limp is questionable but I figure I could play trickier with deep stacks in a fairly loose passive game. I'm pretty sure I'm behind when CO raises and it gets called twice...

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What makes you think they all don't have 4-high?