Haven't bred dwarf gourami's personally, however i do know that you will have more success if you set up and cycle a separate for them- frozen (not freeze dried) or fresh foods bloodworms, daphinia, artemicia and krill etc are all good for conditioning small fish with for breeding; i would advise against using tubifex worms though as these has been known to come from area's contaminated with raw sewage and aren't that nutritionally great either way.