The HJ is a nit - 13/10, no idea how he reacts to 3bets yet.

The cold caller is a 30/7 drooler.

Do you try to isolate the fish without any idea how the nit deals with being 3bet, or do you flat and play with relative position?

Poker Stars, $0.10/$0.25 No Limit Hold'em Cash, 6 Players
Poker Tools Powered By Holdem Manager - The Ultimate Poker Software Suite.

BTN: $26.86 (107.4 bb)
SB: $15.44 (61.8 bb)
Hero (BB): $25 (100 bb)
UTG: $56.67 (226.7 bb)
MP: $31.91 (127.6 bb)
CO: $25.79 (103.2 bb)

Preflop: Hero is BB with T T
UTG folds, MP raises to $0.87, CO calls $0.87, 2 folds, Hero?