Change the pH/oxygen level of a tank?

how would i be able to monitor and control the pH and oxygen levels of a fish tank? Have the pH at5, 6, 8, or 9 for exampleChange the pH/oxygen level of a tank?
Keeping the water clean is what will keep a steady ph (example: regular partial water changes, gravel vacs, clean filters). But they also make buffers if the water out of the tap is to low or high.



For oxygen levels, you can either lower or raise the water level.Change the pH/oxygen level of a tank?
If you are keeping freshwater fish then you don't need to worry much about ph. Use treated tap water and keep up your weekly water changes and things will remain stable.



If you want to see what it is, buy a ph tester from the fish store and use that for testing.



Oxygen is something you gain by simply adding surface movement to the tank. Power filters are enough to do this in properly stocked tanks, and running air stones will increase it. As long as there is water movement, how full the tank is won't make a difference.
CO2 injection is the safest way to control PH in a tank. More CO2 = lower PH. You will need to look at a hardness table and make sure not to put too much CO2 in the tank. There's a number of online resources discussing CO2 injection to lower PH. Do a search and you should find many.



As far as Oxygen, I have no idea on that one. There are ways to measure dissolved oxygen, but increasing the O2 level is significantly more difficult that PH. An airstone can help increase oxygen, but the water agitation adds more oxygen than the airstone itself. I imagine that you could create an oxygen injection system similar to a CO2 injection.



Whatever the case, you are definitely looking at spending some money on systems like this, and even more if they are automated.



I have an automated CO2 system which probably costs about $250 - $350. I can control the CO2 anywhere from what comes out of the tap (9 here), down to 4 - 5.



There's other methods of buffering PH (Water softener pillows, buffering agents) but these are very unstable and I highly recommend against using them without constant testing and supervision.



A few quick pointers to keep in mind, colder water can hold significantly more oxygen than warm water. Once you get to about 90, it's almost impossible to have any sustained dissolved O2 in the water. Also, salt is another major factor. More HCL = Less O2.

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