Kh measures the buffering capacity or the ability to absorb and neutralize added acid without major changes to pH - yours is very low, crushed coral would help a bit, i know you can't get to any right now, but it's worth trying to find.
General hardness (GH) refers to the dissolved concentration primarily of magnesium and calcium ions. Other ions can contribute to water hardness but are usually insignificant and difficult to measure. When fish are said to prefer ``soft'' or ``hard'' water, it is gH, not kH that is being referred to. gH will not directly affect pH although "hard" water is generally alkaline due to some interaction of gH and kH.
Incorrect gH will affect the transfer of nutrients and waste products through cell membranes and can affect egg fertility, proper functioning of internal organs such as kidneys and growth. Within reason, most fish and plants can successfully adapt to local gH conditions, although breeding may be impaired.
Since your KH is so low, i would recommend doing water changes frequently, and keep a close eye on your PH, since many things can affect that and you don't have hardly any buffering right now, your ph could take a deep plung reletively quick.
ways to increase your GH would be Adding limestone to the aquarium (this will also increase kH which in turn will increase pH). Adding calcium carbonate (baking soda) will raise gH and kH
here is an in-depth article about GH,PH & KH
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