KH and Safe-T-Sorb - The Planted Tank Forum
 
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post #1 of 6 (permalink) Old 08-19-2014, 01:52 AM Thread Starter
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KH and Safe-T-Sorb

I just did my 40B with 40lbs of Safe-T-Sorb, normally my kh is around 3 and my GH is a little higher 4 or 5. I mix tap water with RO water to get it like this. Out of the tap KH is I think 19 and GH 21, I'm not really sure haven't tested it for a couple months.

Before with flourite my kh/GH would never change. Now my GH still remains constant but my KH is bottoming out to 0. I added 1, 1/4 tsp baking soda to get the KH up to 2-3 yesterday. Tested and it was at 3. I tested it today after I got home and it was at 0 again.

I added more baking soda, my question is, will this fluctuation in KH hurt my fish?

How long will this go on for?

Should I add more baking soda then 2-3 degrees worth?

Last edited by latchdan; 08-19-2014 at 01:53 AM. Reason: spelling
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post #2 of 6 (permalink) Old 08-19-2014, 07:48 AM
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I've used STS in a few tanks and it is a KH hog. I recently read (can't remember who but it was here) and they said that it may keep sucking carbonates out of the water for years!!

I haven't noticed my fish or plants having a problem with the STS, snails on the other hand... I'm not adjusting anything, that's too much of a game. I have a grow out tank with just STS and plants and Ramshorns. Those are not nice shells, and once the snail dies the shell just keeps dissolving.

Possibly check posts by 'Diana'.
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post #3 of 6 (permalink) Old 08-19-2014, 10:39 PM
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Yes, STS removes KH.

I use potassium bicarbonate to add the carbonates back in.
A change of about 2 German degrees of hardness (and the resulting change in pH) is not a problem for fish. More than that might be, though, so alter it a little every day, not a larger change once a week

I used baking soda for many years with Soil Master Select (pretty much the same material as Safe T Sorb). 1 tsp baking soda per 30 gallon tank = 2dKH, and would raise the pH from 'off the chart low' to 6.2 and I would do just that much a couple of times per week. I do not know where that substrate ended up, I have moved the tanks around so much, but I do have several tanks that seem to have stabilized.
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post #4 of 6 (permalink) Old 09-19-2014, 09:03 PM Thread Starter
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I wanted to give a little update on my safe-T-Sorb tank since its been about a month since last post.

I've been adding around 1/4 to 1/2 teaspoon of baking soda daily to keep my KH 3-4. I've also increased the tap water to RO ratio by 1/5.

I also found out that my GH was bottoming out as well so I started adding 1/4 teaspoon of seachem equilibrium.

I believe the STS is slowing down a bit I checked my KH/GH today and they both were around 4 so I didn't add any baking soda/equilibrium. I'll check it tomorrow to see if anything has really changed much. I may have to just add baking soda/equilibrium every other day.
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post #5 of 6 (permalink) Old 09-20-2014, 01:43 AM
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You could also try using coral sand in the filter. A nylon stocking of coral sand is easy to remove if it is not doing the job, or is over doing it.
I have a tank that is a blend of Turface (Similar to STS) and coral sand, and it is stable, but harder water. It is roughly 50/50.
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post #6 of 6 (permalink) Old 12-12-2014, 04:48 PM Thread Starter
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Just wanted to give an update, after 4 months my safe-t-sorb doesn't seem to be absorbing my KH/GH at a crazy rate anymore.

My KH and GH are a staying between 3-4 degrees with just water changes now.

Wanted to give a heads up to anyone else that was wondering how long it will absorb for. I used 1 bag in my 40B
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