Thanks Ian. Especially for your comments on Magnesium, I bet a Magnesium shortage trips a lot of people up.
I just want to clarify a couple of points.
Some people do report seeing cloudiness when dosing large amounts of all in one into hard water (they have a large tank). This is thought to be the iron reacting with potassium phosphate and precipitating out as insoluble iron phosphate, which is then unavailable to plants. They either increase the dose or revert to dosing macros and micros on alternate days as per standard EI.
I have seen this cloudiness in my own tank (180litre low tech) and it was resolved by reducing phosphate levels, as detailed in the first post of the thread.
As for tank water, never measured pH but most people, even with hard water, who inject CO2 will find tank pH about 7-8 dropping to 6-7 with 30ppm CO2, so still perfectly fine for EDTA.
Agreed. That's why this thread is titled 'dosing a low tech tank', where in my experience iron shortages with EDTA are more likely.
Having said that, even if everything is growing well, there is no harm IMO in spending a fiver on some iron chelated with DTPA and seeing if you get an improvement regardless of low/high tech or dosing strategy. Like a nice cherry on top of the cake.
Does someone with the knowledge fancy putting some info down on how to create an all in one I can dose daily for a high tech tank with Thames water also exactly what to source and from where.
I've been using APF EI micro/macro but would like an all in one that can be dosed daily so I can just let my doses get on with things.
Allinone recipes for high tech are the same, the only change is you are likely to be dosing more.
As myself and Ian have said JamesC's site is the definitive guide. Think of this thread as just my opinion on the addition of extra Mg and FeDTPA for low tech hard water tanks.
I just get my ferts from ebay or sponsors. If your unsure, post up what you find and someone will comment on its suitability. JamesC site has sources too.
If you have any more specific questions post them up and I'll help if I can.