97s.

[jhall23]

I like 20 on the flop for 2 reasons. It might make him fold a little bit more. If you decide to push the turn it is closer to a pot size bet and doesn't look as weird.

On the turn I can't really say, but I have found against lots of short stacks they are more willing to call off a pot-sized all in on just a flush draw. 50bb isn't super duper short so this may not be the case for this guy, but I definetly see fishier stuff when they are calling off their case chips with a short stack.