水草情迷

dear alex,
can you please tell me the dosing of your pmdd.
thank you very much.

I will start with 0.5ml (10 drops per day) for my 140L tank or 4ml per week. Then gradually increase the dosage.

Pls help to verify this.

Wait for your result~~

AZOO 水草螫合鐵肥
係唔係你地講0個隻啊?
點解要去到廣州買咁遠?

你睇睇 Azoo 果隻 D 色野先
佢係啡色既 ==> Fe3+ 既色
即係佢 D ligand 冇用 或入面既 ligand 不足以保住支野 (Fe 2+ 氧化成 Fe 3+)
Fe 3+ 係冇用既
Fe 2+ 先有用 ==> 係綠色既

To Alex 兄，
睇左你條pmdd Formula 同Super 兄所介紹的網頁，預備跟住做，發覺兩者的份量大致相約，祗有CuSo4兩者相差為1：10。係唔係有問題，還是祗是配方不同。謝謝解答。

Hi Simon, Actual the formula I derived are from 2 different sources found in thekrib's site, most of the PMDD formula were originate from thekrib's site.

I deliberately use less Cu's content to proximate the content of Cu2+ in TMG, since I think that too much Cu2+ is dangerous to livestock and plants.

http://www.thekrib.com/Plants/Fertilize ... ert.html#2

Good luck.

Maybe just get the macros? The trace elements are only required in very small amount, overdose is toxic to fish, ie boron, Cost might not justified them too.

For myself, i use K2SO4 for the K, KNO3 for the N, KH2PO4
for the P, MgSO4.7H20 for the mg, and CaCO3 for the
Ca, these are the macros, then add trace elements by using
one of the commercial fertilizer, ie, Azoo/JBL/TMG. Or cheaper still, get those hydroponic trace elements mix.

Just my 2 cents...

Also, I just scope out approx quantity of each of the
macro chemicals, and stirr them in half a cup of water and just toss the whole mixture into the tank, sometime without even totally dissolve them. The fish will come and eat them and them spit them out!

Btw, the PMDD does not last too long once u mix everything together, some chemicals will precipitate out. Also, keep them in the dark, away from light.

About the grade of chemical, i don't think it matters much, certainly no need lab grade, industrial/agriculture grade is ok, and much cheaper too.

My chemicals i got some of them from horticulture friend in S'pore (they do tissue culture from plant cells), and got some from my friend in a bio lab in Uni.

Getting all the ingredients are going to cost a lot, esp the traces, which are only needed in very small quantity. U also need to make a fair amount of quantity, to ensure u can measure accurate enough. I think getting more people to share maybe the way to go, since the solution doesn't keep well for too long, Fe2+ in EDTA still slowly oxidize to Fe3+, and precipitate out.

多謝各位的解答。暫時領略到的是化學品宜少不宜多。另外，我諗住每種化學品分開成獨立溶液，會唔會靈活D，不過就會好多個樽。重想問下，係唔係硫酸鹽才需要用Na2EDTA螯合，其他可以直接溶成溶液使用。化學品方面，己托人在廣州買了Na2EDTA，RMB 20 for 250 g ，純度為99%。其他化學品會繼續托人在廣州買，希望唔會太貴。
另外，想知道，唔要的溶液，可唔可以倒落馬桶，會唔會污染環境？

Hi simon, from what i know, only Fe2+ needs EDTA to lock it, to prevent it from turning into Fe3+ too quickly. Other ions
do not need EDTA.

睇過一篇文章話硫酸鹽經螯合後毒性會大減，不過呢輪睇左好多呢類文章，暫時未搵倒係邊篇，搵倒再post 條link 上來。

http://www.wxp.ks.edu.tw/aqp/s13.htm
原來就在Terence介紹的網頁中，其中一個Topic有提到sulphate要用edta 螯合減少毒性，並介紹如何計算edta的用量。根據文中所講，似乎祗有sulphate需要edta去螯合。

請問有冇人發現死魚情況呢??? 相信單一 K2SO4 and KCL 都可能毒死(without edta) 魚... 唔知係咪咁橋呢?

Sulphate (SO4) should not be toxic. The toxic stuffs are some of the trace elements, ie, the heavy metal ions. This are needed in very minute quantity.
Also, their toxicity is affected by the pH, hardness of water, species of plants and fish, etc.
Just an example of the toxicity of copper, see:
http://fins.actwin.com/aquatic-plants/m ... 00091.html

I think one has to be careful with these heavy metal traces. So it pays to gather more info.