New to darts.I'm also keeping multiple species in the same enclosure.

[Mentat]

It's been done; but myself don't recommend it . If you want to do regular aquariums; think 20H is good for a pair .

[DigitalPunk]

Once you load a 10g tank with soil and plants it does not leave much room at all for the actual frogs. I have a 10g I moved my Ranitomeya into in an emergency, but they will be getting moved back into an 18x18x24 as soon as I can manage it.

The 12x12x18 aren't wasted if you keep them. Those make excellent tanks to raise froglets in for the early months of their life. A 20g L tank converted to a vertical tank makes an excellent sized home for a arboreal species.

If you are wanting to go with an Exo Terra type tank I would do a 18x18x24 for a pair of Darts and an 24x18x24 for a group of 4 to 5. Most Darts will not use the 24" height, but it allows you plenty of room for live plant options

Then you need to factor in adding Micro fauna to the soil of the terrarium. Living plants or not you will want to keep a healthy supply in the tanks for the dart frogs to snack on in between your normal daily feeding. It can take up to 30days for a Springtail colony to establish itself in your tank once you add them in.

[canadian frog]

so what im reading here is that even though they are dart frogs you shouldn't house them together if they are different types of dart frogs, is that correct, I don't have any yet but the colours are amazing, and I was thinking of getting a few different types and housing them in the same tank.