50NL Trips facing flush-completing turn

PokerStars No-Limit Hold'em, $0.50 BB (9 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

UTG ($58.30)
UTG+1 ($41)
MP1 ($150.05)
MP2 ($22.50)
MP3 ($68)
CO ($24)
Button ($46.25)
SB ($10)
Hero ($49.50)

Preflop: Hero is BB with 7, 8.
1 fold, UTG+1 calls $0.50, 2 folds, MP3 calls $0.50, 1 fold, Button calls $0.50, SB completes, Hero checks.

Flop: ($2.50) 5, 8, 8 (5 players)
SB checks, Hero bets $2.25, UTG+1 calls $2.25, MP3 folds, Button calls $2.25, SB folds.

Turn: ($9.25) 9 (3 players)
Hero ???

---

UTG+1 was a 70/0 over 10 hands, and I had no hands on Button.

What's your move on the turn, and what's your plan on the river?

Check. Every draw hit on the turn. Call only w/pot odds to fill up. Otherwise fold to a substantial bet.