Hey dlove, you can buy the pH down at almost any garden center and save on the shipping it would cost online. Home depot carries the one I mentioned:
Green Air Products 32 fluid ounces pH Down, for Adjusting pH in Hydroponic Systems Model # 93302 Internet # 202020504
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Each product you use will move your pH. It would be wise to adjust your pH in a separate container to the proper pH *before* adding it to your main system.
I do mine in easy to carry 2 gallon jugs. Once you have the measurements for one container, (like 15ml of this, or maybe only 10ml...), per/container, then it speeds up the mixing by allowing you to just measure each one without testing every container.
I do this where I test the first jug of each batch for the proper amounts to add and then just put that amount in each jug with a graduated beaker.
The extra hydroton will keep that light out for you. The algae will disappear once it has no light.
Good luck!
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