[Larude]

You don't need to worry about UTG+1 he probably called with a small pair. CO could also be raising a broad range of hands. The coldcall of the BB is suspicious though, he could just be calling with AK or AQ. I think the merits of checking are highest, you don't loose any weaker hands + you have 2 outs to what probably is the nuts and if a heart comes you have a redraw to a hand that still could be the best. By betting out you take the pot if nobody has an ace, but you force weaker hands out + you risk beiing reraised by a FD or an ace and then you probably have to fold. The question is is it worth to bet here to protect against potential FD's?