Great pictures Matt
As far as the Cobitis goes I would lean towards C. palidica as it has the two black spots at the base of the caudal as does C. vettonica which is difficult to distinguish from C. paludica.

This could be Iberochondrostoma lemmingii - very similar mouth shape

This could be Atherina boyeri, permanent freshwater populations have been reported in the same areas as the cobitis and Iberochondrostoma
Pardon my honesty - I am a Northerner
14 loach species bred, which will be next?