It's not one certain element... it's a combination of all of them. You
will be surprised at the power of the CO2 without dosing ferts and doing a
10-15% water change every week. Your plants (at least mine do) get a lot of
their food from water changes.




Hey everyone.

I've had a planted 75 litre tank for just over 2 months now. Some of my
plants weren't doing quite well (turning yellow & brown then rotting). I
upgraded my lighting, bought some liquid fert & I just got a Nutrafin CO2
Natural Plant System. We'll see if all this helps...

So here's my question. If I was to get one main test kit for a planted
aquarium, which one is most important? Iron? Phosphate? Nitrate? (I
already
have PH, Nitrite, Ammonia, KH & GH)

Thanks for the help.
Ciao!

Mork.