In this game home team have many problams with squad, expecially in back. 
They are in a great run, they are unbeaten in last 7 matches. On the other hand, Gold Coast is struggling and they havent win in last 6 matches after great win against Brisbane where they played very well and win deservedly. 
Ive watched Gold Coast few times this year and I cant understand why they are in the last position in league. They arent too good, but I dont think they deserve last position. 
My opinion on last GCU matches is that they just havent enough luck. In last GCU match against Melbourne, GCU captain Thwaite scored his 1st goal in professional career, so I think that atmosphere in the club went up a little. 
Although Perth is better team right now, I think that GCU can win here and take all 3 points. Small- middle stake for me.

Good Luck!