So I have the water test strips and I did a tap water test and RO water test (has remineralisation filter). The parameters seem very near to my surprise. GH is around the 75-150ppm (great for fish right?) . Do you think its safe to just use tap water for my fish now or there might be other traces that might hurt them like zinc , lead, copper...etc? I will be using Seachem Prime , will that help?