need help i have a 55gallon tank the water that i have is well water the ph is over 8 the alilinity is very high and its very soft the soft water is ok for my tetras but not for my mollies and platys i've been using aquarium salt to provide the hardness that i need i've been doing this for 8 months and its been working last week i changed out 20 gallons of water with out the salt and i lost 3 platys and 1 mollie after 3 days and the rest of the looked like they were going to die i added salt back to the water and they all perked up every one says not to use salt but its the only thing that i can get to work i've added some live plants to my tank also does any one know if the salt will hurt the plants i add 1 table spoon to 5 gallon of water if any one knows the answer let me know