this is definitely not a flop that you want to be semi-bluffing. You are out of position and are against 4 opponents, one of whom will have hit this flop pretty good.

Also, you don't have a particularly strong draw given the board, and are obviously not that pleased with your 8 high flush.

On the other hand, you seem to be up against a 7, whether he has the boat or not is pretty well unknowable at this level, as he will most likely play it the same either way. You do however still have a fair amount of money behind and 2 outs to the straight flush, so calling the turn min-raise isn't bad because you arent necessarily behind, have outs to catch up if you are, and your opponent is probably not very good at getting full value out of his hands.

I would call the turn and call a reasonable river bet if you dont make the nuts. If you do, push. He will usually call with or without the boat.