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I have been having some trouble with my water parameters after over dosing on a product a few months ago. I have slowly been working on my wp and have finally got them close to where I want them in my tanks, I just need some help to get it even closer to where I want it. Tank 1's Wp is ph 6.6 gh6 kh1 Ca40 and the TDS is 170~ Currently the MG:Ca ratio is 2.79 - This is my divided tank holding PRL BB and Pintos Tank 2's WP is Ph7.2 gh11 kh3 Ca60 and the TDS is 215~ Currently the MG:Ca ratio is 1.29 - This is my OEBT tank Ideally I want tank 1 to be gh5 kh1 and Mg:Ca ratio 3.5 - I was thinking to do this is to add pure RO water to lower the tds some more then add more GH until the ratio is where I want it. My question is there a better way to get this ratio and what do i use to raise gh? Ideally I want tank 2 to be gh 7-8 and kh 3-4 with the Mg:Ca around 3.5. This is the tank that had the most issues and I lost quite a lot of OEBTs at one stage. I think I have got the WP at a stage where they are surviving and breeding again but I would like to get it a little better for them. I just need some help/instruction to get it there properly. I know in both tanks I need to increase the Mg but I dont want the overall Gh to increase or the TDS. I am also not sure the correct product to buy to increase the mg safely. What I have been doing is add RO remineralised with Salty shrimp at a lower tds then what the tank was every water change to slowly bring my tds down. Any advise or guidance will be much appreciated. I think Tank 1 would be ok where it is atm but I would really like to get tank 2 closer to ideal if possible. Thanks.