deposits

I did a 2/3 water exchange recently because I had to get water levels down to clean class of algae. I rinsed ceramic noodles with water from aquarium, changed out the carbon for new *Marineland brand, changed out the Phosgard, treated new water with normal chemicals for chlorine, etc., I also...

I live in an apartment with hard city water. My tank gets white calcium deposits all over it on the outside and I would like to know what I can do to prevent this. I can clean it but really want to prevent it. I use water conditioning chemicals with enzymes to get rid of chlorine and other...