How to lower KH and GH?

[Manrock]

My KH and GH seem a bit high for my planned introduction of Crystal Red shrimps (although my Cheery Reds thrive in it). The results are from a dip test so must be treated as very approximate;

pH 6.8
KH 7
GH 10

I usually make my water 50:50 with RO:Tap as well as adding a pinch of the Kent 'RO Right' supplement. Tap water here is on the hard side. Water changes are monthly and about 20%

... so, to lower the KH and GH slightly do I just need to up the RO % in my 'made up' water? Maybe 70:30 to start with?

Cheers

 

[krazypara3165]

From my knowledge pure ro has no gh or kh (or very very little) so upping your ro amount should do the trick.

 

[Iain Sutherland]

or pure RO with a shrimp remineraliser would be good depending on the size of the tank.

 

[Ed Seeley]

If you're mixing RO with tap then you don't need to RO right - it will just increase your GH. Increase the amount of RO to reduce KH and GH and if you want it very low then use pure RO.