Review on 🐠 API PROPER pH 6.5 Freshwater Aquarium Water pH Stabilizer - 8.5oz Container: Maintain Optimal pH Levels for Your Aquarium by Ryan Draper

Be very careful when using with exotic plecos and other sensitive fish, it really works but when you change the pH you change too other parts water, after adding 6.0 to 6.5 in 5 minutes. That same evening my green phantom died. Could be a coincidence. I won't use it again but it works. Be careful. I gave it 4 stars because it does what it says. But if you have expensive fish, just change the water.