I recently built a 760 l vivarium and planted over the weekend. I am now letting the plants grow in a bit and checking that the environment is stable and that there is no problems with the enclosure (humidity stable at 85-93% and temperature up to 26.2 degrees Celsius in the day and down to 24 at night - all helped to be kept in check with fans and a humidifier controlled buy a raspberry pi - data available here: https://thingspeak.com/channels/436974). Note I have been checking this only for a week but the temperature in the room is relatively constant during the year and I expect very little change.
I have 4 question:
1. Is 26 degrees Celsius still OK for D.tinctorius Azureus? Most of the information mention their range of temperature is 22-27 degrees - but is this the range where they are comfortable?
2. When is the best time to acquire frogs? I was planning to let the vivarium settle for 3 months but is this enough and should I do anything else in the meantime to prepare?
3. Where is the best place to buy D.tinctorius Azureus in Sweden (this is the species that I am interested in)?
4. Is there any place to obtain flightless fruit flies? I read that there are cultures of these but have not been able to find any (I have some normal fruit fly cultures that I feed to some ant I keep but there is an obvious problem with them being able to fly
Any information would be appreciated (English or Swedish - sorry again for writing English on a Swedish forum).
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Here is an image of the vivarium I built just before I added the substrate and planted the plants. I am mostly happy with how it turned out - but any comments on how to make it better for frogs would be appreciated:

