I wouldn't do it myself, I've heard of many stories of these frogs dying due to waste build up. Of course, a clean up crew and live plants will help, but only to a degree. When large frogs are kept bio-actively, it's usually in large zoo sized enclosures.

How much eco earth are you going through? I only use enough to give 2inches of burrowing substrate and I change the substrate each month, though I might start doing it twice a month soon just to be safe. So will go through 4 blocks a month soon, which is about £10 where I'm from. I usually feed outside the tank in a large faunarium to prevent substrate ingestion and this allows the frog to catch its prey before the insects dig or hide and lose their supplements. Some keepers and breeders keep their frogs on foam and this can be cleaned for several months before being discarded. You can cut holes in it for a burrow or provide hiding spots by fake plants or cork bark. You have to make sure there's no chemicals in the foam, though.

Amazon milk frogs and whites would probably do better a large bio-active tank, but they also need UVB lights and a basking spot and the plants may need additional lighting.

I think simple is better, but with small frogs like darts, bio-active tanks can be good since a 2ft viv will be plenty large for waste to be broke down and will reduce handling, which is good since they're delicate but large frogs usually aren't.