Hi, I'm new to sng's, trying it out at 3.50 level

And I have one general question. You are in the money with two fishes. (I know it's rare in your level but 3.50 where 6-7 fishes per table are standard- this happens lol.
So, we are itm with 2 complete fishes. Is our general tactic to play tight and increase our chances to stay with one fish HU, or we should play more flops and use our skills to kill them postflop and earn chips which will make us huhge favorites to finish in 1st place. For the purpose of studying let's say that we have all similar stacks and not much room for postflop play due to pretty high blinds.
Also, if we want to see flops vs these guys, do we limp many bvsb from SB?
Sorry if it doesn't make sense, I'm a cash game playedr who is learning sng's and I can't use on push- fold stage of sng's, always think I should bring fish postflop..
Oh this become long, sorry for that.
All in all,
gl with your challenge and crush it