First off this isn't my first planted tank, but this is my first massive fail!
I'm so fed up.....
Background.
This tank has been dry started for 7 weeks. then filled for about 2 weeks before I rescaped and filled again for another 2 weeks.
Until 3 days ago I didn't have many fish or shrimp in the tank. 3 Amano to clean amd 2 Oto cats to clean
Levels were checked every few days and read normal through out the last 2 months.
Eater changes and dosed ferts, and low level of co2 pressurized.
Problems in the last week....
Plants are melting and or getting holes in them
I returned them to my 5 gallon tank, they were fine. Put them back few days ago, same problem! They start to die....

2 days ago I tore down my small tank as I'm selling it. And so I transferred all my baby shrimp and 5 neons to my current tank
Literally over night, insist cloudy water, so I checked levels. All super high, like off the chart readings..WTF
Now I can't get it under control. Lost 15 baby shrimp,so far 2 Cory cat fish.
Done 3 50% water changes and it has not helped.
Useing prime, and slime coat additive as well as a small amount of cycle.
Help!
I feel silly asking since I should probably know what I'm doing wrong!