I agree-- Darts aren't all that mysterious or special, as long as you have the right temps and humidity and plenty of fruit fly food cultured ahead of time. Also the planted tanks they are usually kept in are biologically recycled, so there is very little cleaning, except for keeping the glass clean and trimming off plants. A ten gallon with a couple of D. leucomelas would be a nice beginning. The general rule is about 5 gallons of space per dart frog, although this varies, depending upon the particular habitat or species. Most dart keepers think the bigger the better.
Some darts are more territorial than others, and need to be kept in mated pairs, or a least with only one female, but others are more gregarious and even do better in groups of the same species. 10 gallons won't hold a group, however, just a couple of frogs. So D. leucomelas, D. auratus, D. galactonotus, P. terribilis, don't need to be sexed to get along well. The D. leucomelas, D. auratus and P. terribilis, are all readily available and among the less expensive frogs to begin with. Don't be afraid to try them. If you read the care sheets and accommodate them with the right temperatures and humidity (65 to 80 degrees and 80 to 100 percent humidity) they will do just fine. Your tank can be as simple as merely providing a drainage area for the plants with a substrate of something like sphagnum moss and coconut fiber on top, to a more complicated tank of backgrounds of cork barks, water ways, drip walls and water falls with a false bottom. A ten gallon tank is better kept simply to a drainage of gravel and an organic substrate as above, for the plants. I like to separate the gravel drainage area of about 2-3 inches of gravel from the substrate with a layer of week cloth to filter out the debris. When the drainage gets full of water, you just siphon it off or use a turkey baster from one corner. The tank needs to be enclosed rather closely, usually with a hinged glass lid, and lighted with something like an aquarium fluorescent light for the plants on top of this. for 12 hours a day. You need to mist daily with spring or distilled water, and feed the frogs with fruit flies dusted with vitamins that contain both calcium and D3. (No UV reaches them, so D3 supplementation is essential.) We usually use a combination of Herptivite and Rep-Cal (without phosphorus). You can also use Dendrocare.
Otherwise, other than cleaning off the glass, you don't have to change substrate or do much maintenance except for trimming the plants.
The "beginner" darts are actually easier and just as hardy as other frog or toad choices.
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Patty
Pahsimeroi, Idaho
4 D. auratus blue
6 D. galactonotus pumpkin orange splash back
7 D. imitator
6 D. leucomelas
6 D. pumilio Bastimentos
4 D. fantasticus
6 P. terribilis mint and organe
4 D. reticulatus
4 D. castaneoticus
2 D. azureus
4 P vittatus
2 P. lugubris