thank you for your kind words =)
that pic shows a male bolivian ram with long, flowing fins, and a female with short stubby fins.... although females can get longer fins, it is less common, and they are plainer than the males.
The steel blues are in the same tank as the Bolivians, and a heap of other fish - and yes the steel blues are relatively common now in shops and are among the easiest to order in because of the sudden interest by hobbyists.