went through this complete thread. However i have some questions the answers might be there already but i dont seem to have found them , also i want to be sure that i am doing the right thing so please bear with me.
KNo3 , K2so4 , i want to dose these separately and dry. I got the funda that i need to dose these immediately after a water change ( 50 % ) recommended.
Chucks estimates have a threshold or target ppm for each of these , i have a planted 6 foot tank and estimate is about 500 litres or 130-140 gallons.
KNO3 - If add .8 tea spoons 0r about 4 gms it comes close to the 4.8 ppm. target 5 ppm as per the calculator
K2so4 however the target is 20 ppm and it comes to 3.5 tea spoons , 17.79 ppm which is close to the target. when i read the posts i dont see such a big difference in qties of the two chemcicals hence i need clarifications because the calulator target ppm is very different.
Am i reading the calculator right , i dont want to dose till i am doubly sure , i dnt want to kill my plants in the tank or get a big algae bloom. Please let me know if my inference is right.
Also is it ok to dose after say a couple of days of water change ... if yes what reductions / additions i need to do assuming that i didint dose anything then
Please help me answer the above
Mag sulphate / Microsol - I am clear about the dosing these.
You have to check how many ppm K will be added along with the KNO3 from the calculator.
Subtract this from the target 20 ppm.
Also if you dose KH2PO4 for phosphates, this too will contribute K. Deduct this ppm of K also from 20 ppm.
You can find all these K additions from the calculator.
Then use the calculator to find K2SO4 needed to make up the deficiency.
Chuck's dosage limits is for 2-3 watt/gallon medium light aquaria.
If you use 3-5 watt/gallon light, Estimative index is what you need and there the limits are up, for K it is 20-30 ppm, NO3 - 20-30 ppm, PO4 about 1ppm. CO2 should be up there at 20+ ppm.
That's where you see the high levels of NO3 appearing in the thread and leading to your doubts, the thread has been going on for so long now. Anyway it's better to leave it as it is and get the clarifications in.
Depending on your light levels keep K, NO3 and PO4 at about 20-30 ppm, 10-30 ppm and 0.2-1 ppm you will be OK.
If your macro levels are up and you get algae, then it is CO2 that is lacking or you have an ammonia spike.
In a well established tank the nitrates are very well generated by the Feed itslef, So be ware of that, Your nitrate dosage at that point of time should go down.
Madan et all....
Are there any sources where we get pottasium in its molecular form. Rather than in the compound form (not the lab grade), I see a bit of pottasium defitiency, But nitrates and phosphates are high as my tank is crowded. I am in a short span gonna give away my fishes and house much lesser number of fishes, But in the mean time i was just wondering if pottasium can be fed directly to the tank in its molecular form.
Joined: May 02, 2006 Posts: 1742 Location: Bangalore
Posted: Tue Jul 31, 2007 10:39 am Post subject: Re: PMDD - Micronutrient Mixture
What i wanted to know was something like a K2O or a KOH which does not contain Phosphates or Nitrates and wanted to get more data on it before i try it, I am not sure if even that is safer to be dosed to the tank. I was looking at alternatives so that i do not have too much of nitrates sulphates or phosphates but still i could bring up my pottasium level in the tank.
Joined: Jun 29, 2003 Posts: 7087 Location: Bengaluru, India
Posted: Tue Jul 31, 2007 10:47 am Post subject: Re: PMDD - Micronutrient Mixture
If you can find K2O please let us know how good it is for a planted aquarium. Any product containing K2O (Flora Pride or some such name is one)has been rejected long ago in the hobby. I threw away my bottle long ago.
KOH? Dunno. It's scary.
Forget alternatives, KNO3, K2SO4 are time tested in agricultural use. No need to reinvent the wheel.
Its not funny. I have my bottle of PMDD in the fridge. Once during a function in the house, one of the ladies felt thirsty, opened the fridge and took 2 good swigs before she realised it wasn't sweet or tasted odd.
This was despite the fact that the bottle was labelled with skull and crossbones and on it was written "Fertilizer -DO NOT DRINK"
She showed no ill-effects although, I made her visit a doctor with the packet of Microsol-B to confirm that no internal damage was done. She and her better half were mighty embarrassed though
I still keep the bottle in the fridge
What really scares me though are the bottles of Glutaraldehyde and Chloroform for my experiments with acrylic. These are double sealed and stored on the highest shelf in my house at the very back and every resident of the house has been instructed not to touch them.
KNO3/K2SO4/KH2PO4 are kept on top of the tank - don't really worry about them...
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