I hope somebody can help me out as this is driving me crazyI have changed from tap to remineralised RO waterI use aquasoil in my tank for crs and cbs.The problem that I have is that the ph just keeps fallingThe RO has a TDS of 12 and PH of 6.5 to 7I reminelarise using Jayc'c DIY method to get to tds of 140 and GH 5.5But the Ph keeps dropping and sits at 4.5 to 5Can I use baking soda to increase the Ph?Before changing over to RO the water was PH 6.5 and the tank has been running for around 4 months now