never bluff a fish?

[Guruman]

CO villain in this hand is a true to life honest to god manna from heaven loose passive unthinking fish.

SB is most likely not sophisticated enough to check and induce a bluff with a pair on that river.

Absolute Poker
Limit Holdem Ring game
Limit: $1/$2
6 players
Converter

Pre-flop: (6 players) Guruman is BB with 8[img]/images/graemlins/diamond.gif[/img] 4[img]/images/graemlins/spade.gif[/img]
2 folds, CO calls, Button folds, SB calls, Guruman checks.

Flop: A[img]/images/graemlins/club.gif[/img] A[img]/images/graemlins/diamond.gif[/img] A[img]/images/graemlins/heart.gif[/img] (3SB, 3 players)
SB checks, Guruman checks, CO checks.

Turn: J[img]/images/graemlins/heart.gif[/img] (1.5BB, 3 players)
SB checks, Guruman checks, CO checks.

River: 7[img]/images/graemlins/spade.gif[/img] (1.5BB, 3 players)
SB checks, <font color="#cc0000">Guruman bets</font>

my thoughts here - if this hand checks through I lose it for sure. If I bet it though, there are tons of better hands that look like they're begging to fold. I'd check this with a K or Q, but having cards so low seems to swing this one to a bluff for me.

Crazy or KrazyKool?