mollys & neon tetras

I have a 25 gallon fish tank, In the last 3 day I’ve lost 11 out of 13 fish ( 2 angles 6 tetras 2 mollies and 1 telescope eyed goldfish) the only survivors were two other balloon belly Molly’s. The fish all did the same thing, go to the bottom of the tank lay upside down or on there side then...

Hi guys, I've got a 125 litre fish tank with Molly's and Jumbo Neon Tetras but the neons are staying to the back of my tack near the plants etc... Can anyone help please or give me advice on this??