Re: Question on buffer combination
You will be fine using Neutral Regulator. South American Cichlid Buffer and Neutral Regulator are both phosphate buffers that buffer to 7.0. I would not recommend the use of South American Cichlid Buffer 4.5+ or Acid Regulator to try to achieve a pH of 7.0. If you have an existing bicarbonate based buffering system in your water then it will take a lot of any of these buffers to overcome the buffering system already in place. You can test your existing bicarbonate buffering by testing your KH (Carbonate Hardness) of your water. Neutral Regulator is virtually impossible to overdose and has the added benefit of removing chlorine, chloramine, ammonia, and softening water (pulling out excess calcium and magnesium).
There are two ways to achieve a 7.0 pH in your situation: 1) Simply use enough Neutral Regulator to overcome the existing buffering system or 2) Use our Acid Buffer to dissolve some or all of your existing bicarbonate based buffering system so it will be easier to establish a phosphate based buffering system with Neutral Regulator. All that basically has to happen is to use enough of a phosphate based buffer to overpower your existing buffering system. Once Neutral Regulators phosphate based buffering system is established, it has the ability to hold pH at 7.0 for up to a month.