shortage on picture, which is it (one out of three I'm sure of)

[Koen_v_V]

I have only three species with damage, and I'm thinking of shortage of nutrient.

Question one, I'm sure what caused this two weeks ago: View attachment 1710

Then the other two:
View attachment 1708
View attachment 1709

Anybody has suggestions? To me it looks mobile nutrients, the Potamogeton wrightii has somewhat yellow tops when biomass of the tankis getting bigger. At that moment, the number of damage is getting bigger. I'm thinking in order of likelyness: C, N, P, K

Or maybe I have to throw in more nutrients to be sure what is or isn't... EI style

 

[scottward]

Don't waste your time solving specific nutrient deficiencies etc, you will end up going crazy! ;-)

Dose EI. It allows you to quickly and easily rule out nutrient deficiencies. That's what it's for.

The only nutrient to then focus most of your effort on, and craziness, is CO2.

Scott.

 

[Koen_v_V]

Scottward, thanks for the confirmation. I'm allready slowly increasing CO2, 5-10% per 2 weeks, to rule out 'CO2'.

Hopefully my current two Koralias on to of the three eheim have ruled out 'flow', they did gave major increase in health for the plants few months ago.

If the CO2 doesn't improve things (when biomass doesn't increase to much), I'll try adding N, P and K.

 

[scottward]

I would rule out the NPK first! Much much easier than getting the CO2 right i.e. isolate CO2 so that it's the only remaining variable. All the other variables, light, NPK, micros, are easy to rule out.