The rostratum only arrived yesterday, so are in a tank on their own for the time being. I'm not sure where they will end up yet. Having watch them for a bit they will certainly be going into a large tank with lots of open areas of fine sand. Watching their feeding behavior is going to be fun
I got some Taeniolethrinops praeorbitalis as well yesterday. I'm guessing they might work well with the rostratum.