Do a 20-30% water change every week instead of a 50% every few weeks. It's more about frequency rather than volume.
Now, when you say >there is a filter, it was putting air into water
are you talking about an actual filter that allows for beneficial bacterial cultivation, or just an airpump with a sponge or something? >room temperature
It depends on the shrimps, but all are pretty much tropical animals, and they need higher temperatures. Room temp might be too cold for them.
Some other things you need to consider:
Did you actually cycle the tank?
Do you vacuum the substrate? You don't want any leftover food lying there, as the ammonia it produces can and will kill everything in the tank.
Did you maybe overfeed or underfeed them?
Also, when anon asked you about water parameters he was mostly referring to ammonia, nitrate and nitrite levels. The fact that you didn't mention them means that you have not tested your water, and most likely have not even cycled the tank. If not, that's 100% why everything died.
The fact that your frogs are still alive does not necessarily mean that you have a well-established tank. Frogs will just swim up and breathe air, and the toxic ammonia levels will not necessarily kill them that fast.
Also clean your tank, it's a huge eyesore.