Hello, Jeremy.
Welcome to the forum.

First, lets get you educated to dart frogs . Azureus are great starter frogs.

Here is some info about Azureus.

http://www.joshsfrogs.com/dendrobate...-for-sale.html

And an article about dart frogs.

http://www.joshsfrogs.com/catalog/bl...frogs-as-pets/

I keep all of my dart frog temps in the low to mid 70's. too high of temps can kill them. Get an accurate thermometer for in the tank. There are many options. Check in the amphibian/reptile section of any pet store. Be sure the edges are smooth and safe since these guys can climb.

Humidity is best around 80%. Too low of humidity can cause dehydration, too high can cause respiratory infections. Dart frogs can tolerate temporary humidity highs of up to 100%, but should not remain at a constant 100%. The fogger is great for this. You'll definitely need a good hygrometer to keep measure. It is good to have a small ventilation strip or screened hole. Some vivarium builders add a circulation fan with a safety netting or mesh over them.

Here is an article on building vivariums.

http://www.joshsfrogs.com/catalog/bl...-construction/

I, myself, am not fond of the hydroball bottoms. I prefer having a hole drilled in the bottom of my tanks with an access drainage port to remove excess water from the soil. This makes maintaining the tank much easier. I make eggcrate false bottoms for mine.

Moving the soil is easy. Just save it.

You can either keep the frog in its current set up or keep him in a quarantine tank. I always quarantine any new frogs until I know how healthy they are, if they're eating and pooping, and to monitor their behaviors. I do this for at least 30 days. I use a glass tank, safe lid, paper towels as flooring, a properly cleansed and prepared pothos or other vine, a very shallow water dish (not necessary if humidity is proper), a thermometer, hygrometer, and for darts perhaps a bit of leaf litter.

While the frog(s) are in quarantine, you can build the vivarium. This also gives you time for building their future home and letting it cycle.

Fruit flies... You'll also need to learn how to make fruit fly cultures, unless you're lucky enough to have a store available that has cultures to buy year round. My Petco sells them, so I sometimes get a bit lazy in making my own, but I always keep supplies on hand. You never know when a delivery truck might get held up in the winter weather. It's best to always have more cultures on hand than you think you need.

Springtails... Same goes here, have extra available. "Seeding" the soil is great. It helps keep your vivarium soil clean and provides an extra source of food for your frog(s). Isopods do the same. I keep and extra culture of springtails on the side also. You never know when you might need more.

Supplements... You'll need to get a Calcium with vitamin D 3 amphibian/reptile supplement and a multivitamin phib/reptile supplement also. There are many brands. My favorites are Repashy calcium plus and Repcal calcium/D3. This is a must for healthy frogs. For my small darts I do a light fruit fly Repashy dusting 3x/wk and Repcal 2x/wk. for my adult darts I only do Repashy 2x/wk. I rotate the days. You will hear variations in vitamin schedules from different people. At minimal you should use calcium/vita D3 2x/wk and MVI once/wk. I have had great results with my schedule (as above) and have learned from some of the best breeders.

A quick note... Frogs without vitamin and calcium with vitamin D3 supplementation in captivity can develop deficiencies. You may hear about Metabolic Bone Disease. This is caused by lack of calcium and can be fatal if untreated. Prevention is best. Calcium cannot be properly absorbed without vitamin D3. If you have any questions, let me know. I can elaborate further.

Size of tank... A general rule of thumb for frog tank size is 10 gallons per adult frog. Some frogs are social and some are aggressive. Depending in your species you can house more than one. Azureus like to be in pairs. Of course, male/female pairs are best, though sometimes you do not know the sex when you get them if they are young. A pair would appreciate a 20 gallon or larger.

Types of tanks... Any types of tanks will do if you set them up properly. Aquariums, front-sliding doors, etc. I prefer the Exo Terra's. I like the 2 front doors for easy access. I have a glass cutter cut glass to replace the top screen. I have them sand the edges. I rinse them down good to remove any possible glass debris and then dry them and silicone them in. My current tank is going to have a hole cut into the glass top and I will be siliconing a mesh vent to allow a bit of air circulation. You can also do this for your fogger. Be sure to place screening over your fogger tube so the frog(s) do not climb up and into the tube.

Plants... Tropical plants can be used in vivariums. Choose plants that can tolerate high humidity. Air plants such as bromeliads do well if placed in the backgrounds. They will rot if placed in the wet soil. There are lots of plant choices.

A few options (but there are many more) ...

Bromeliads
Tillansia
Java moss
Baby tears
Dracena
Peperomia
Some orchids
Ferns
Begonias
Selaginella
Fittonia
Pilea
Anthurium
Syngonium
Ficus
Anubias
Pothos
Calathea
Philodendrons
Aglaonema
Spathiphyllum
Tradescantia