There are 3 Solomon Fosters marrying in Croydon after 1850 up to late 1890s .... this must be yours ... I started the last search at 1871 for some reason ...
Marriages Mar 1863
FOSTER Solomon Croydon 2a 199
FREE Eliza Croydon 2a 199
THORNTON Charles Croydon 2a 199
THORNTON Isabella Croydon 2a 199
this is them in 1871 census of Croydon - RG10; Piece: 844; Folio: 69; Page: 55 - 4, Gravel Pit Cottages
Soloman Foster 27 Head of Household born Essex Hempstead (or Stanstead?): a Porter
Eliza Foster 26 Wife born Cambs, Horseheath
Anna Foster 8 dau born Essex, Walthamstow
Charles Foster 6 son born Croydon
Eliza Foster 4 dau ditto
Solomon Foster 2 son ditto
Baby Foster 6 Days son ditto