Fun hand from insane 10/20 game

[mike28]

Live at some random place in san diego. Game is 10/20 with a forced 40$ live straddle, so it plays pretty big. The stacks vary from around 50k to 5-6k and it's very agressive.

Hero has just moved to the table, and is running fairly hot to start his first few orbits. Effective stacks are 7k. He limps AA utg and obv only an unkown limps behind him, and another limper in the co.

Flop Q64r. Hero leads for 150, UTG+1 limper pops it to 500, folds back and he calls.

Turn is an 8, hero checks, villian bets 900.

Would later find out later that utg+1 was fairly tag and solid, but against an unkown how do you take the hand from here? Against a tag?