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Is there any free and cheap DIY ways to test our tank pH, Kh and gH2007-11-24 23:37:36

If you do your regular (weekly) partial (25-30%) water changes, all of the levels will be at or very near 0. Also, you should vaccuum your gravel (see your LFS for details) at least once every 6-8 weeks.

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i don't know

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If you know your Ph you can determine the other 2 through simple charts. Here's a link for you on that.

http://www.drhelm.com/aquarium/chemistry.

Also - if you plan on continuing the hobby you really need a water testing kit. It is a priceless tool in keeping good water quality, and there is no way to operate properly without it (unless you like driving to your LFS to have them test your water - which you can do but with gasoline at nearly $3 here in the US - well - albeit you should just buy your own water testing kit).

You can get one from Aquarium Pharmaceuticals for around $20 with shipping. Here's the link for one to purchase.

http://www.amazon.com/gp/product/b000255.