Cheers guys, they are Hypsophrys nicaraguensis or Hypsophrys unimaculatus depending on what site you read lol.

At the moment the male is about 4" SL and the female is about 3"(ish) and I have these set up in a 4x2x2 with the 4" female jag for the moment. Plans for now is to get some successful spawns from them, they've laid eggs on about 5 or 6 occasions, but because the eggs are non adhesive, with their inexperience they've always managed to sweep the eggs away then the jag has stepped in to eat them.