Re: Sodium thiosulphate

Fallout wrote:
"Elaine T" <eetmail-fish@xxxxxxxxx> wrote in message news:Pd_3f.3834$7h7.3571@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx

Fallout wrote:

Hi

I have been trying to source a supply of dechlorinator that does nothing but dechlorinate. According to my LFS the Tetra product only contains Sodium thiosulphate, but the label says that it will also remove heavy metals.

Does Sodium thiosulphate remove metals as well as chlorine? As I mix my plant food in with my change water and dechlorinator I think I may be making the iron etc unavailable in the water column.

Any more info would be much appreciated.

- Jon 

If you can find it, I believe Genesis is pure thiosulfate.

I've never had problems maintaining adequte iron for plants with water treatments or even carbon or Chemi-pure. Are you seeing chlorosis? Have you tested your iron levels to see whether you actually have a problem? Iron in the water column must be chelated to stay in solution so I doubt that it's available to react with heavy metal removers.

--
Elaine T                        __
http://eethomp.com/fish.html  <'__><
rec.aquaria.* FAQ http://faq.thekrib.com


I'm not seeing any signs of chlorosis, but I was wondering if I needed to add ferts at all if it was being made unavailable to the plants in some way. I am now adding the fert a few hours after the water change just in case.

I do test for iron levels, but have only done so up til now just before a weekly water change, at which point I can never see any trace. I guess I probably need to dose more and test after the water change. Am I right in thinking that a just detectable level of iron is about right?

Thanks - Jon


I don't know what your kit is, but many only measure free iron. Free iron should be undetectable because it's toxic.

Chelated iron levels depend on the plant species, light level, growth speed, and whether you have a laterite substrate. I shoot for 0.1 ppm to 0.2 ppm of chelated iron in my slo-grow 2wpg tanks, but some plant tanks need considerably more. Tom Bar recommends 0.1-0.2 ppm iron for a plant tank that has iron (laterite, Flourite, etc.) in the substrate, and 0.2-0.5 ppm for one that doesn't.

Many of us with plant tanks dose ferts and trace every other day. That way, more is available to the plants as various fertilizers are used up or precipitate out of solution.

--
Elaine T                        __
http://eethomp.com/fish.html  <'__><
rec.aquaria.* FAQ http://faq.thekrib.com
.

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