OKay, yes, the water is a big issue. It needs to be treated. I use seachem prime but there are others out there.
Second, the tanks are too short/small for the amount of frogs you're putting in them. 10 gallons per frog when it comes to grey tree frogs is the standard recommendation and is very fitting to this species, in my opinion.
Third, all new frogs should be quarantined. Unfortunately, when you do a naturalistic viv, and have a frog die in it, you HAVE to take it apart and disinfect or replace everything. You can dip the plants in a 10% bleach solution, bake the cork bark etc. But you cannot just leave it or you'll perpetuate a cycle of infection. It could be fungal infections, parasites, bacteria, we do not know but obviously something is very wrong.
Fourth. They use the water like a litter box, that is where they potty. So it either needs to be changed daily, or filtered and changed weekly. I bet if you got some test strips out, you'd find some major issues with the water that live plants will not fix. It's going stagnant and becomes a breeding ground for bacteria.
I would quarantine all frogs as you get them. A bare tank, maybe a branch and some leaves to provide coverage. Damp, unprinted paper towel as substrate that is changed every 1-2 days. A bowl of treated water that is changed daily.
As for the compost, I would just get rid of it, get abg soil if you want to grow plants. I would get rid of the water bottom, they do not spend their life primarily around water, they spend it in trees. You need a tall tank. I would put the abg in with a drainage layer and just a bowl for water. Try having only 2 frogs for a while and see if you can keep them alive.
They need sturdy branches, they can be heavy frogs and if they do not feel comfortable and secure on those leaves, it could stress them out.
Right now, I would get the remaining frogs into a quarantine tank and get a fecal test done. Being wild caught and having been exposed to pathogens in the tank where other frogs have passed, that's pretty much necessary.





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. Home Depot Top soil has stuff on it that is not good for any frogs or amphibians. The only soil we recommend for planted frog vivariums is Atlanta Botanical Gardens or ABG type soil. You can buy pre-mix or Google the recipe and mix it yourself. The second problem was chronic chlorine exposure. Amy and others have already given you fixes for both issues. Good luck
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