Aggression into Passive Limpers

[sirlurkalot]

My first hand posted, so please cut me some newbie slack.

Saturday afternoon 10/20 @ Borg. Table is loose and very passive, a real limp-fest.
Five limp including villain UTG+1, an unknown young player recently arrived from must-move, SB completes, I check BB w/Q6o. ($70 – 7 players)
Flop 5-7-8 rainbow, I check, hoping to c/r a bet and numerous calls, but it’s checked all around.
Turn Q no flush draw. SB checks, Hero ???

Thanks in advance; regular posters on this board have helped me immensely!