I have two questions:
First can i get a breakdown of edta, dhtp and eddha? I heard one is good for soft low ph and another is good for hard high ph...one lasts for 4-6hours the other last for 3 days...depending on hardness and ph? I'm not quite clear among all the searches i did.
In case of soft water and low ph, which one would be good?
Second, any of these okay as source of iron:
First one has HEDTA as oppose to EDTA. From my laymans understading, does the H break off from the EDTA when in water? or HEDTA overall toxic?
Second one has eddha which i hear last longer in water and doesn't precipitate or degrade in light? However, I recall some people turned off buy it's brown pinkish hew it leaves. Any experience?
Here's a picuture of edta vs eddha for what it's worth, again eddha possibly kickin butt due to being light proof: