Can you add vinegar to water to lower the PH before adding it to your aqaurium? Is it safe? I understand its not good to lower the ph to much in a short time but is vinegar safe for aquarium plants and fish?
I agree, it's really a PITA to try to keep a stable pH when you start trying to change it.
What is it out of your tap? Most fish will easily adapt to a wide variety of pH's providing it's not bouncing around all the time.
If you really want to lower it, using something like peat is much better - or C02.
Great unit, easy to put together and cheap. I highly recommend getting the unit with the water container, this gives you 3 gallons of water available quickly at any time, otherwise waiting for 3 gallons to be filtered can take 30-40 minutes depending on the membrane size, temperature and water pressure.
There are even cheaper models on ebay, worth the expense considering what we spend on everything else and the control it allows you to have over water hardness and PH in your tanks.