So my hardness level in my tank is really high and I have no money because I have no job. So I cannot go out and buy a Reverse Osmosis machine like I have read on a post. Its because I fill up my tank with tap water, and my tap water is really hard. I'm not sure if there is any cheaper options to lowering the hardness level. It was around 300. It said on my test strip. If you know of any cheaper options to lowering the hardness no - 0 gh- 300 kh-300 ph-8.4 I'm not sure if this test stip system if accurate or not, but I do have a 10 gallon freshwater tank and i don't have fish in it at the moment.