The G. pygmaea grows inside our tropical greenhouse since about one year now. Temps during day are in summer around 25 - 35 degrees centigrade (using a fan and sprinkler), and 14 - 20 degrees during nights. In winter it is cooler, about 20 - 28 (day) and 12 - 16 (night). We also grow G. repens since many years under this conditions. However, I know that (i.e. by Fernando Rivadavia) cooler temperatures are recommended for these species, but actually also our conditions work.
G. repens develops seeds very easily and behaves since many years invasive like some Utricularia, but is much easier to separate from pots where it is not welcome. For G. pygmaea I must wait until the seeds from this season germinate - or not. However, with the mentioned conditions I keep G. filiformis alive, but it did not flower since about three years.