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Need help with my tank

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first of all - im new at this hobby and i just registered (hi everyone!). I have two problems with my 20L tank - one leads to another (i hope).

First my water info:

Ph - 7,0

NO3 - 5ppm

GH - 5

NH4 <0,05ppm

NO1 <0,01ppm

KH 6

24C temp

water conductivity: 300 uS


the tank is 5months old and i used H.E.L.P. Advanced Soil PLANTS for my soil.


I use RO water that i minerlize with mineralitor for crystal red shrimps.

For filtration i use Fluval C2 filter with prefilter, cotton, sponge, seachem matrix and seachem purigen.


The problem is that something is increasing my GH and uS parameters - i did 50% water change yesterday and today parameters have change GH 5->6 and us 300->360us (im sure it will be more by tomorrow). Because of this all my attemps in breeding crystal shrims have failed. Im attaching my tank img.


I would really appreciate the help!


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What are the stones in there?  They are likely the issue.

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Your welcome.  They look like Seiryu Stone (couldn't remember the name last time and couldn't guess close enough for google to know what I was talking about).  If that is what they are they definitely impact water parameters.  You can also put them in a bucket of water (RO is probably best) and see if they change the parameters.

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