You need to stop putting fish in the tank, The neons will almost certainly die I'm affraid, Infact all may do except the danios, Have a look at the stickys in the beginners section for info on cycling etc.
Loaches will not help with keeping ammonia down, they add to it.
At the moment you really need test kits to keep an eye on the water quality and do very regular water changes, Or take the fish back where you got them and cycle the tank.