The midfielder spent time on loan with the Cod Army last season, and although he started the weekend game as a substitute, he was introduced after just eight minutes at the Highbury Stadium.
Jon Parkin gave the hosts a second half on 67 minutes, with Marrow doubling Fleetwood's advantage two minutes later to seal a 2-0 victory.
Rochdale moved into the automatic promotion places with a comfortable 3-0 home win over Plymouth Argyle.
Rovers defender Jack O'Connell played the full match for Dale as the visitors ended the match with ten men.
Anton Forrester played just under an hour as Bury held promotion-chasing Burton Albion to a goalless draw at Gigg Lane, whilst Anthony O'Connor and his Torquay United team mates were frustrated as their game against Northampton Town was postponed.
In League One, Brentford lost their place at the top of the division as they were held to a 1-1 draw away at Walsall.
The Bees had started well when Clayton Donaldson gave the visitors the lead, but Walsall levelled on the stroke of half time through Craig Westcarr.
Alan Judge started the match and played 68 minutes as Brentford stretched their unbeaten run to 15 games.
In the Scottish Premiership Yann Songo'o made a winning debut for Ross County.
Signed on the Saturday morning, the Cameroonian went straight into the Staggies side as they recorded an impressive 3-0 home win over Dundee United.
Fellow Rover Jordan Slew also played the full match for Ross County, getting an assist for their second goal as County move up to tenth in the table.
John O'Sullivan started for Southport as they slipped to a disappointing 4-1 away loss at Hereford United.
The midfielder played 73 minutes, whilst fellow Rover Kellen Daly was an unused substitute for the Sandgrounders.