Please help me diagnose the death of my RETF!

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Hello all, I've had another thread up for a few days about caring for my newly aquired Red Eye's, however this morning I awoke to my little male frog lying on the ground expired. This saddens me a great deal; however I'm much more enthrawled with figured out exactly what factor(s) contributed to it's death and to prevent them from happening to my female frog (who seems healthy.)

Here are the basic questions that need to be answered:

1-size of enclosure
I am using a 12x12x18 Zoo-Med NT-2. I was told from several sources that this would be okay for a while (1-6months) while I save for a bigger enclosure.

2-# on inhabitants - specifically ( if there is another frog ---size differences ?)
Two red-eyed tree frogs, one female (about an 2 inches long from nose to butt) and one (expired) male (about 1.25-1.5 inches from nose to butt)

3-humidity
Anywhere from 60-80%, depending on the time of day. I mist them down twice a day (morning/night) and as needed to bump the humidity.

4-temp
Daytime: 75-80F, Nighttime: 65-70F without heat lamp on, 70-75F with lamp on.


5-water - type - for both misting and soaking dish
Both misting and the water portion of the tank uses bottled spring water.

6-materials used for substrate
Layer of LECA, Exo-Terra Forest moss, Eco-Earth, and a minute amount of Forest Moss on top of the Eco-Earth.

7-enclosure set up i.e. plants( live or artificial) wood, bark etc -how were things prepared prior to being put into the viv
Four branches inside the enclosure - used with different reptiles before/no bugs/washed them prior to use
One live Dracaena Deremensis Ulises, artificial philodendron leaf, artificial pothos vine, and it had a few Neanthe Bella Palm stalks before I yanked them out to
put more branches in. There is a "pond", the length of the enclosure, about 3 inches wide, and about an inch deep.

8-main food source
Dusted crickets, however I can't seem to tell if the frogs are actually eating any. For every 10 that I offer them (4 a night), one or two is missing. The crickets are placed into a ceramic bowl which they cannot escape from.

9-vitamins and calcium ? ( how often )
No vitamins, calcium powder on every other night of feeding crickets. I do however have some Zilla Vitamin Supplement Spray on hand.

10-lighting
Daylight: 12 hours of light with a 60watt "Blue" daylight bulb with UVA. Supplement heating and night lighting (which turns off when I go to bed) is a 50watt Exo-Terra NightGlo light. It's a blacklight, essentially.

11-what is, specifically, being used to maintain the temperature of the enclosure
Lighting and the ambient temperature of the room.

12-when is the last time he ate
I have absolutely no idea. =/ The last day there was a cricket missing was yesterday morning.

13-have you found poop lately
I have found some poop in the "pond' area every time I change the water. Not a lot, but a few excrement.

14-a pic would be great ( including the frog ) any little cell phone pic is fine
This isn't embedded, to save the squeamish, but this is a picture I took of the dead frog after I put him in a zip-lock baggy.
http://img.photobucket.com/albums/v6...n/deadfrog.jpg
This is a picture of the female:
http://sphotos.xx.fbcdn.net/hphotos-...71047677_n.jpg

15- how old is the frog
Not sure. I was hoping somebody could tell based on size.

16-how long have you owned him
Got them both on the 15th of April, so about a week and a half.

17- is the frog wild caught or captive bred
Captive bred from a Vendor at the local Reptile Expo.

18- frog food- how often and if its diverse what other feeders are used as treats
Crickets, I tried putting some mealworms in a seperate dish last night. None of the mealworms or crickets where missing this morning.

19- about how often the frog is handled
Once by the vendor, once into a "holding" tank, once into the current tank.

20-is the enclosure is kept in a high or low traffic area
Low traffic, in the corner of my bedroom with two of the glass panels blacked out. (the panel that views the bedroom doorway and the panel that views the back)

21- describe enclosure maintenance ( water changes, cleaning etc)
Water change every 2-3 days (the pond area holds about 1.5 liters of water), spot clean every day. Mist twice a day or as needed.

Please help! Any other questions, I'd be happy to answer. I'd like to think it wan't from bad husbandry, however the fact that it survived a week and a half in my care leads me to believe that I've neglected some certain fact and killed it by ignorance.