I'm not really sure what it is... some plastic material the pet store had in the tanks. (This shot was literally about two minutes after getting them home.) I'm taking it out though because I'm not sure what purpose it's serving. I bought a 12"x12"x30" tank that we're splitting in half for them... just letting the silicone dry right now.Congrats. What are they? Rosea? Anyway welcome to the addiction
EDIT: I just noticed the white stuff in the tank on the right, what is that?