Which of these species is best for beginners? I am new to PDF's and am getting one this summer sometime.
*Dendrobates Tinctorius (Dyeing Poison Dart Frog)
*Epipedobates Bilinguis (Eucuadorian Poison Dart Frog)
*Epipedobates Pictus (Spot-Legged Poison Dart Frog)
Which is easiest to keep and how many can be kept together?
What size tank would I need?
Which would be most likely to breed?
How can you tell the males from the females?
Sorry for all the questions I just want to get it right.
Thanks.

Out of the list given I would say that Dendrobates Tinctorius would be your best bet they are one of the larger darts, come in many colors. Though all darts are very sinsitve to Humidity changes. It above all must be 100% correts for a good set up. As far as how many can be kept most give 5g per frog so base your number off the size of your terri. Breeding darts can be panstaking. Rasing and droping the humidity to get the males in the mood. If it's done right any dart will breed as all the darts you listed are non-egg feeders most the work will be on you after the eggs are layed. If their given lots of egg laying containers at diffrent levels they'll just do their thing given the right conditions. Sexing is the hard part if it calls it's male, if not it's female. Though only adult males call, so if your planning on young frogs, get say 5 to be sure. It can be hard to tell what one is calling too as they love to hide and some spp. aren't real loud.

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I am probibly going to get a group of 3 to 5 froggies. I was thinking I could keep them in an Exo Terra. What size should I get? Here is the site that I found them on but I'm getting mine from Petco or Petsmart.

Exo Terra Glass Terrariums

What type of moss is best for them?