First Dart Frog Trio

[audi772]

Hey guys, had the day off today so I went down to, my local pet store and walked out with frogs. The store is going through some changes and they have put a few of their vivariums and their own breeding frog pairs up for sale. Ended up getting the 18x18x18 setup that they have had there for years along with the three auratus dart frogs that have been in there for as long as I can remember. The trio is already breeding and they have been for a while now. I've seen this trio in there for a couple years now. I have had it setup in my living room now for about 5 hours, temp is staying at 71 and humidity is at 85%. The employees hadn't fed them yet today so I told them I would do it when I got them settled in today. I bought one culture of hydei fruit flies. Fed them about 35 minutes ago and they all ate well. I only have a couple questions so far. One is with the setup of the vivarium itself. I know that normally you have a drainage layer with some sort of media down in it, but this setup just has about 2 inches of standing water, an eggcrate layer, then a screen divider, then the other layers of substrates. Is this type of bottom layer usable? Or should I change it and put some media down there? The other question is with the frogs. I just recently gained interest in frogs so everytime I saw the frogs before I never looked to close at them. But now that I have them home I have began to notice that two of them are a very distinct blue and the other is a distinct shade of green. The store employee told me that they were all Panamanian green and bronze. I saw on joshs frogs that this color type can range from blue to green. So I'm not sure if I have three of the same frogs or two are the same and the other is a different color type.... I added some pics below but its hard to see the difference of color in the pictures. What do you guys think? Am I alright or am I mixing frogs? They have had this trio together for quite some time now and they have been breeding them. That is also what I plan to do with them. If the size of vivarium they are in is an issue I do have a bigger setup that is in the planning stages but it wasn't meant for these guys so if they are alright in here I'll leave them. They have been in this setup for a while to and still actively bred while the store had them so they seem happy. I am very happy with them, fantastic to watch and its only been a few hours. Any and all advice please share. Thanks guys!!