It's pushing it a bit, to be honest. If you take the "rule" of 1" of adult fish per gallon, your 10 GNTs and the honey gourami get you to 12". Juliis are 2.2", so 6 of them takes you to 25". I personally don't live by that rule much anyway, but even taking the other rule of 1cm per litre, jullis would still be pushing the boundaries a bit.
It depends upon A) how much filtration capacity you have B) how scrupulous you would be over waterchanges (volume and frequency) and C) how well you think you would/could react if something went wrong.