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Low TDS but high KH/GH?

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Hello all, I am new to the forums, though I've been reading them for quite some time. :icon_bigg

My first question is one I can't seem to find addressed here, or on any other site: does TDS matter if the GH and KH are in a good range?

My SoCal tap is around 180 TDS from the faucet, with a KH of 11, and a GH of 12, and a pH of 7.5.

Ideally, I'd like to reduce both KH and GH to half, or a quarter of their current values, because I'd like to keep a cherry shrimp tank. I've been experimenting with cutting my tap water with distilled water 50/50, which does indeed reduce both the GH and KH by half (while maintaining the same pH), but also takes my water down to a puny 90 TDS.

From what I've read, the majority of concern over TDS numbers have to do with whether the KH and GH numbers are sufficient, not necessarily the remaining dissolved solids? So then, does it matter that my TDS is only 90? Does it matter that my tank is planted, in terms of nutrients the plants might need as well?

Most people I see with higher GH and KH numbers also have TDS in the 300+ range, so my tap's numbers are kind of throwing my understanding for a loop. :icon_conf Any help in this area would be appreciated! Thank you.
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I am also new to all this stuff, but I am working on it..

I know depending on your TDS, it could be reading NaCl, or a few other things... Check what your TDS actually measures then check for what the parameters are needed...

I just found this little chart last night so I will include it for ya...

Also, I think there is a Seachem equalizer that works to help... but you would want to look up that specifically since there are a few different types... Replenish, Equalizer, ect...
 

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Ideally, I'd like to reduce both KH and GH to half, or a quarter of their current values, because I'd like to keep a cherry shrimp tank.
I can't honestly even tell you what my TDS is, but fwiw, I keep several types of neos in water with a GH of 8-9 and a KH of 19. They do just fine. As long as you aren't trying to keep crystals, I think you're ok without messing with anything.
 
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