Medium Flush Against R/R

Scuba is 50/15, LAG, seems to be messing around on some hands, calling reraises OOP, etc. What's your move on the turn?

Bodog History for Hand #821765193
Hold'em No Limit ($0.10/$0.25) - 2007-07-23 23:01:59
Table 'Sea Island' 9-max Seat #5 is the button
Seat 1: Wolfpacksb ($16.05)
Seat 2: simba11 ($30.05)
Seat 3: bodidlauno ($22.65)
Seat 4: Chicago_Kid ($26.80)
Seat 5: Barry281 ($38.19)
Seat 6: Scubadoc5 ($25.50)
Seat 7: Zipnpip ($48.60)
Seat 8: gothamgeek ($12.80)
Seat 9: Clapton ($17.83)
------------------------------
NEW HAND
Scubadoc5: posts the small blind $0.10
Zipnpip: posts the big blind $0.25
--- DEALING POCKETS
Chicago_Kid is dealt [Jc,9c]
gothamgeek: folds
Clapton: folds
Wolfpacksb: calls $0.25
simba11: raises $1.00 to $1.25
bodidlauno: folds
Chicago_Kid: calls $1.25
Barry281: folds
Scubadoc5: calls $1.15
Zipnpip: folds
Wolfpacksb: folds
--- DEALING FLOP [3c,3d,5c]
Scubadoc5: bets $1.00
simba11: folds
Chicago_Kid: calls $1.00
--- DEALING TURN [6c]
Scubadoc5: checks
A New $0.10/$0.25 Texas Hold'em table Halden has started.
Chicago_Kid: bets $4.00
Scubadoc5: raises $4.00 to $8.00
Chicago_Kid: ???