Many thanks for your comments - it makes the hundreds of deleted files and thrown away slides worthwhile!
All the shots on the 4040 are taken during the day using high fstops (f8 and up) in fill manual with a DS125 mounted directly above the lens and and Sea & Sea DX 90 mounted high to the right for fill in.
All the shots (taken in the day also) on the F80 (with the exception of the silvertip which used provia and program mode) used manual with TTL, DS125 and Sea and Sea duo 90 set in "classic" macro position, Velvia film and were scanned as 5MB Tiffs at my local store and then reduced in Pshop. Apertures were in the f11 to f16 range.
I have to thank Bob for his kind (and true!!) advice concerning velvia and provia, notably the ability of velvia to handles blacks very well which is notable in the pics. Its much more a result of Fuli Velvia and Nikon lens (105 and 60 micro) rather than myself.
4040 shots - anemone fish on red an' , blue nudibranch, anemone fish, frog fish and shoal of goat fish.
f80 shots - porcelain crab, cuttlefish, hawkfish, janns pipefish, silvertip, xeno crab, moray with hinge beak shrimp.