I recently had to stop using my R/O and had it taken out of my house. It wasn't producing water fast enough. Was only getting about 10 gallons a day. I plan to get a new, bigger one in a couple of months. I am now having to use the tap water and the ph is way up there at about 7.8-8.0. I need to lower it. I'd like to get it around 6.8-7.2 for my arowana. Since the ph has come up he's not eating as much. A LFS guy said baking soda diluted in a water cahnge would help. Never heard of this. Will it help? I have a water softner. Should I bypass it or is the soft water okay? This is the first time I've ever used tap water in this tank, so excuse the duh factor.