Are the era report and fm the only sources of I of for the sea foxes? I'm interested in Tiburon but want to get as much info as possible before getting miniatures and force lists and themes made :D
Paint them! I don't know what color they're supposed to be.... and technically there are tons of sources for Clan Sea Fox.
They are in the Novels Hunters of the Deep, Pandora's Gambit and to Ride the Chimera.
They have a large section in touring the Stars... and if you open up the MWDA Unique's PDF and do a search on Sea Foxes it'll stop you on almost every page for mechs. There are two warriors listed in that pdf as well.
Otherwise, yes. The Era Report and the Field Manual
The only paint schemes we've seen at all are the Ilclan's and Skate Khanate.
Skate is all dark blue (almost dark purple) with metallic cyan highlights. the Ilkhanate is the opposite. Its all metallic cyan with some dark blue (almost dark purple) highlights. You can see both in the Unique's pdf.
though I'm more interested in Tiburon and Spina Khanates schemes myself.