Fisher lost a fourth game in a row in December as Erith & Belvedere won 2-0 at St Paul’s on Monday.
The visitors struck in either half to take the points back to Bexley.
The result leaves Fisher in fourteenth place in the SCEFL Premier Division table with 20 points from 20 games.
The Fish host Crowborough Athletic in the league on January 3. Kick-off in Rotherhithe is at 3pm.