Dartford have extended the loan of defender Luke Wilkinson until the end of the season.
The Dagenham and Redbridge centre-half has bagged two headers in the Darts' last two wins over Havant and Sutton.
The club have also added Ryman League strikers Sam Higgins from East Thurrock and Tony Coates from Concord Rangers on dual-registration.
Meanwhile, Tonbridge Angels have signed former frontman Carl Rook after his release from Eastbourne Borough.
Rook left Tonbridge for Dartford in January 2010, before signing for Eastbourne 18 months later.
Dagenham striker Rob Edmans will bolster a Dover Athletic side, who have not lost in the league since December.
Edmans bagged three goals against the Whites last season for Chelmsford City, but has made just four substitute appearances for Dagenham in 2012.
Ebbsfleet United will stick with their current squad for the rest of the campaign, according to manager Liam Daish.
The Fleet brought in keeper Lance Cronin until May following an injury to Preston Edwards, but Daish told BBC Radio Kent there would be no more arrivals at Stonebridge Road.
"If we can keep everyone fit, we should have enough in the squad without having to bring anyone in today," he said.
"It may happen where someone goes out but I can't see it."