Scared of cold caller?

[Bukem_]

2.50/5 game 5 handed.

Im UTG with red Kings(633), raise to 18

Semi loose, decent button (covers) calls. Super fish(360) in the bb calls since he has 2 cards.

Flop 7 3 4($54), two spades.

Super fish bets $20(he mins bets 90% of the time, with air and the nuts) All I can do is guess he has something.

I raise to $75, both players call.

Turn 4 ($279) now 2 diamonds.

Super fish checks, I ?