I'm having a tough time with hard water. The 30g has been cycled and running well for a few months and the fish were doing fine with the few exceptions getting sick. The 100g has the same story since i've moved everyone from the 30g to the 100g. All the fish seem ok all the ph, amonia, nitrites are good to go except i cant get the water to soften up. I've used some water softeners but nothing seems to happen. Any help advise would be appreciated. thanks in advance