QUOTE(desmond @ Sep 17 2013, 09:55 AM)
Ok.
I have tested the lava rock and ryu rock with vinegar, both also don't have sizzling/hissing sound.
But then after I soaked both rock overnight, they do affect the tds a little.
Before soak
Ryu rock water - 42tds
Lava rock water - 44tds
After soak overnight
Ryu rock water - 45tds
Lava rock water - 53tds
So are they affecting the tds? But the vinegar test is negative @@
Now my water tds at tank is 190. Increased by 5 adi. The only way to reduce tds is by using ro water right? Those water machine at shop is it ro water?
The water machine , don't know how pure the water is as the filter seem never be washed, if your tank is not that big
, can buy those 10L bottled water , let said your tank is 2ft 60L after minus substrate and blank space on top of tank.
should be like 50L++ , a 10L water change = 20% ,should be enough to see the tds down.
remove the lava rock then as they as of not much use anyway.
What soil you using now ? if ADA soil , PH still 7.5 , that mean the buffering power is long gone, not suitable for CRS.
Better re-setup with shrimps soil like benibachi fulvic soil. Pls stay away from Help Shrimps soil if possible.