Easy fold? / Bad fold?

I know preflop is pretty bad. CO c-bets almost always. Was trying to lure him in (don't slow play at 25nl, kmind!...I know I know). Anyways, seems like SB had a set (no read on him though).

Poker Stars
No Limit Holdem Ring game
Blinds: $0.10/$0.25
6 players
Converter

Stack sizes:
Hero: $22.90
UTG+1: $22.20
CO: $25.10
Button: $24.65
SB: $40.70
BB: $28.10

Pre-flop: (6 players) Hero is UTG with 6 A
Hero calls, UTG+1 calls, CO raises to $1.5, Button folds, SB calls, BB calls, Hero calls, UTG+1 folds.

Flop: 3 6 A ($6.25, 4 players)
SB checks, BB checks, Hero checks, CO bets $5, SB raises to $10, BB folds, Hero folds, CO folds.
Uncalled bets: $5 returned to SB.

Results:
Final pot: $16.25

Bet flop. As played poooosh.

I like the check raise idea because you act right before the pre flop raiser, but now I would call the flop min raise. I want to keep anyone with an ace in on such a dry flop. also, more often ppl will slow play til the turn with a set. It's more likely to be Ax, so hopefully you can win two stacks.

it doesnt have to be a set, esp. if SB has also noticed that CO will c-bet every flop. he could just as easily have a strong A or A3. I don't really think he is letting it go, whatever it is, so just push.

I got to see a hand here. No read and not deep enough to fold.

Ouch...thanks for the help. Stupid me.