Hi,
Facing difficulties to lower my GH and KH in my RCS 45L, I made this test:
I filled half of a drink glass with Seachem Flourite Black Sand. Added RO water (KH 0.6) to fill the glass and stir it. After 3 weeks, I tested:
KH 5.4
GH 8
Just shocked. Is this how my tank would go if I didn't make weekly 50% WC? Seachem insist that their substrate is inert. I had really big doubts seeing how much calcium carbonate it holds, but trusted them.
I'm very angry as I really targetted a lower KH than my actual 2.4. Also, I hate those swings of making 50% WC with a KH of 0.6 and it always ends in 2.2. I'm not sure my RCS appreciate this, especially the babies.
So, despite its success, I would never recommend it again
Facing difficulties to lower my GH and KH in my RCS 45L, I made this test:
I filled half of a drink glass with Seachem Flourite Black Sand. Added RO water (KH 0.6) to fill the glass and stir it. After 3 weeks, I tested:
KH 5.4
GH 8
Just shocked. Is this how my tank would go if I didn't make weekly 50% WC? Seachem insist that their substrate is inert. I had really big doubts seeing how much calcium carbonate it holds, but trusted them.
I'm very angry as I really targetted a lower KH than my actual 2.4. Also, I hate those swings of making 50% WC with a KH of 0.6 and it always ends in 2.2. I'm not sure my RCS appreciate this, especially the babies.
So, despite its success, I would never recommend it again