Tonsa are indeed difficult. My culture came in contaminated from the vendor. The plan was to feed them Phycopure (has not been tried by anybody yet, but should work).
tisbe are self-culturing at the moment, they populated a 10g with one tiny fish that is being fed with spirulina and othomine.
Calanoids of the right size are indeed superior to rots as first food for fry of the difficult species.
If you guys want to try tonsa again, we can place an order and have three separate cultures going. Could be an interesting experiment.