[pleco_breeder]

Cichlid,

I did think of one thing that should be rather obvious under magnification without dissection. They are completely different genera, families actually. Blackworms are a Lumbricus sp. They are segmented worms, and this is actually kinda obvious. Tubfex, although they look segmented, actually have a solid outer skin. Under magnification, this shows up rather easily.

Larry Vires