I'd fold.

You're probably behind here... and given the lack of outs (even the 7s and 6s might give someone a bigger boat)... you can't call.

Also, even if you're ahead, tight player and fish probably got outs up the wazoo and it is very likely for at least one of them to draw out on you.

Given those two pieces of information, you're better off extricating yourself from this failed pot stealing attempt and let the tight player duke it out with the fish.

Finally, the all in player further decreases your chances of winning the main pot.

I really don't like the push because even if you do convince tight player that he's behind, he got almost enough odds to draw... making it a call if he got any suspicions that he's ahead. More importantly, given your preflop raise, it's unlikely that he'd put you on a flush at this point (KQ, maybe KJ of hearts are the only 2 logical hands that he could put you on for a flush)