Something is wrong with my mothers freshwater tank she has red parrots in the tank and my dad did a water change and took all the water out and put new water in. Isnt that something you dont do? Then he just throws the fish back in there without acclimating them or nothing now some of them are on the floor or acting strange im afraid they might die what do i do ? One of them was on the side on the gravel i thought it might be an amonia problem so i took out like 20% of water and added filtrated water what do i do now guys i tested the amonia before i did that and saw it read 3.0 i know that's not good. Im not so good at freshwater tanks help please!