Bad play on my part?

Hi all, made a swith over to NL to test the waters so to speak. Been doing pretty decent at the $25NL tables and wanted some input on this hand as I'm not sure if this play was too aggressive for the level or if it was just bad play. I don't have the exact history as I'm at work but I know how it went down.

Hero - MP
LAG - CO
LAG2 - Button

I say lag/calling station because they guys were calling every raise I threw out, 4x - 7x and this is on the Empire network. This was the last hand I was going to play and then leave because the position disadvantage was really starting to irk me.

Hero - AhQh

Hero raises to $1
LAG calls
LAG2 calls

Flop - Ad 6s 6d

Hero bets $3
LAG calls
LAG2 calls

Turn - 7c

Hero bets $7 (little more than half the pot)
LAG calls
LAG2 calls

River - 9d

Hero checks
LAG bets $5
LAG2 calls
Hero raises all-in for $18
LAG calls (doh)
LAG2 calls (double doh)

My reasoning -
Usually at these tables it seems the cold calls come from pocket pairs. I figured I was up against two pocket pairs that missed. The $5 river bet and call felt like very weak sauce to me so I tried to come over the top to rep a possible full house or a flush. LAG took about 15 seconds and called, as soon as he called I knew LAG2 would as well, he took about 8 secods to call.

Results - LAG flips over 87d for flush
LAG2 flips over J f'in 2 of diamonds for flush.

So was my play bad on this? I'm still trying to iron out the proper amount of aggression to get paid off while not losing out on money to betting too much.

The turn bet should be higher - full pot most likely. If your description is accurate, one of these tools may calling that bet too but way against thier odds. By betting half pot, they have better odds - especially the last caller.

I would not reraise that river.
Paired board and 3 to the flush.....(!)

You have to think that your TPGK is beat here, especially with another caller before you.