Low pH/kH in Water, Low = Bad? Options

[Hamad]

I did a water test and my nitrate level is less than 10. There is no nitrite or ammonia, so the water is perfect and I do around 50% water changes every 2-3 days. There's also good filteration and high aeration and heater set at 30C.

But to my shock, the PH/KH are very low and they probably were for awhile because I did not test PH/KH for months as I don't buffer or try to make any changes to it. KH is less than 3d and the PH less than 6.4.

I did a test to the tap water and the results are very much the same. Does this low (but stable) level of PH/KH could have a side affect on the fish?

I notice that my fish usually show stress (very low energy) even though I feed a healthy mixed diet [different pellets, bloodworms, spinach, etc...] also as I mentioned earlier water is great and temperature at 30c which means fish should be more active than this. Could the PH/KH have something to do with this?

[Hamad]

I didn't notice it says GALLONS on that calculator page [thought it was LITRES], so 55 gallons requires 5 tsp, that means I should add two tea spoons daily to increase the levels slowly till I reach the desired KH. Or can I do it in one day?

Where's the "edit post" button by the way, is it just me or it's gone?

[CP]

Where's the "edit post" button by the way, is it just me or it's gone?

You can edit your posts only within a short time frame (15 minutes if I am not wrong) after you have submitted your posts.This is to allow for any corrections that you may have typed wrongly.After that, you cannot edit your posts.