It is great that with the test kit ... you manage to narrow down from the amount of possibilities , okay now this is not too difficult.. kh shouldn't be much of a problem. your ph is slightly on the high side but it is still reasonable and now to alter the gh/tds. 1 cap full of mosura mineral plus(the 180ml one) into 5.5l of distilled water yields about 3gh with 65tds( I had it tested ).. So now my suggestions for you is to get distilled water to conduct water changes( with you doing your own calculations on how much you need) . If distilled water is beyond your budget, you can add mosura M + into your tap water then measure the gh( this time it should around 5-6( it has to be higher than original by quite abit,if you want to see results faster)) . tds wise ,i don't think there is much to worry since you are changing out the water ( and tds of tap-water should probably hover around 80-130 in Jurong area) so an addtion of 65 tds should give you 195 tds at most. The last step is to slowly drip this 'new' water into your tank ( what i did is to use a breeder box and set the drip rate to a very low output, so the water will drip and mix slowly over days)..you don't have to worry about any parameter shock to your fauna this way as sufficient time is given for them to adapt and also the fraction of the water changed in is small compared to the total volume of your tank. repeat the following steps over several water changes (once per week) you should see your gh going up gradually.
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