Hey guys new to the forum I have had a FW tank for about 2 years and I am coming up on a year with my marine tank. Up until now all the research I have done is for Marine or salt water and pretty much the first commandment of salt water is to use RO/DI water. I started using this water and it has really helped for my salt tank. I started using it on my FW tank as well and everything has been fine but the pH on my FW tank is always around 6.0 which is what it comes from the local water store at, is this ok?? I haven't had any fish losses and it seems to keep the algae under control because there is 0 TDS. Now I am beginning to do some research into setting up a planted tank and I was wondering if RO/DI is recommended or not for planted?? If I did use would I have to put additives in the water for the plants?? Also what is everyone's view on water softened water(if that is the correct term)?? Where I live there is a water softener hooked up to the house.