You sound really confused...in all your threads.

First off you need to decide if you want a low tech tank or a high tech tank. This will determine how much you are willing to spend, if you need CO2, how much nutrients you need, what type of plants you can get, how much lighting you need, and how much daily/weekly maintance you are willing to put in.

Once you decide that, you will need to test your water for GH, kH, and pH because if you go with a CO2 unit, it will use the kH and lower your pH. I can fill in more once you answer the above.

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--->Pictures of my 75g Amazon tank<----