I am pretty sure my play here was pretty close to standard, but just want to see what other people would have done in this situation.
Hero (BTN): $2.21
SB posts SB $0.01, BB posts BB $0.02
: (pot: $0.03) Hero
Fold, Fold, Fold, MP calls $0.02, MP+1 calls $0.02
, MP+2 calls $0.02, CO calls $0.02, Hero raises $0.18
, SB folds, BB folds, MP calls $0.18, MP+1 calls $0.18
, MP+2 folds, CO folds
Flop: ($0.61, 3 players) 7
MP checks, MP+1 bets $0.18 all-in, Hero ???
(obv not folding... is raising here a leak as MP may be less likely to put any more money in to pot if you raise? MP+1 already all in)