If you planning on doing a biotope you cant use Java Fern (Asia) or Dwarf Anubias (Africa). A biotope is supposed to be a close representation of a natural body of water. You could do the tank you describe with an assortment of swords, vals and stems. You could use Bacopa, Pennywort, some Ludwigia, Stargrass, Cabomba, etc. As for substrate, there are several options available such as Eco Complete, Flourite, ADA Aqua Soil, SMS, and I'm sure there are a couple I am forgetting about. I would choose between the Bolivian Rams, or the regular blue rams though. Im sure the bolivians would bully the blue rams being that the blue rams would be out numbered.