Hiya, just new here but already have some D. azureus....... the book Poison Dart Frogs by Amanda and Greg Sihler 2007 gives some advice on how many darts to house together:
Large Darts (tinctorius, azureus): 1 per 5 gallons (19L)
Medium darts (auratus, leucomelas): 1 per 3.3 gallons (12.5L)
Small darts (thumbnails such as imitator): 1 per 2.5 gallons (9.5L)
They definitely do not reccommend mixing as reasons of being territorial and sometimes slightly different heat/humidity/lighting needs depending on where their species has come from.
And they say usually to aim for a male-heavy trio or sexed pair of D. Azureus as females are particularly aggressive to each other. Sometimes male heavy groups for leucomelas work well too. Some female species fight each other and eat each others eggs, sometimes frogs can be drowned in a small amount of water if one sits on top of the other's head!
Dendroboard.com are useful and I use dendroworld.co.uk as I'm in England.
Hope this may have been of some help.
Love dart frogs, they're great
Jade
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