rotala macrandra 'mini type 4' and rotala orange juice leave discoloration

[heavenkid]

My rotala macrandra 'mini type 4' and rotala orange juice leave have severe discoloration, not in a good shape. I have no idea what went wrong, here are my spec and dosing regime.

Can advise me know what went wrong?

Mine is a 47gallon tank, 90x45x45cm.I using a zetlight zt6400 and chiller.
light is on 7hrs daily, co2 is on before 2hrs the light turn on and all the way till the light is off.
I try to achieve an 1.2ph drop.
Before co2 come on, tank ph is 6.7. After 2hrs of co2 on, ph is 5.5

I dose weekly
20ppm k
7ppm no3
7ppm Po4
5ppm Mg
0.4ppm Fe/traces

 

[Edvet]

A bit lean on N i think. Looks like to little CO2 to me, how is flow? ( pH drop sounds good)

 

[dw1305]

Hi all,
Assuming the new leaves really are pale yellow? Then it looks likely that your iron chelator isn't working effectively, and the iron (Fe) you've added has precipitated out of solution and become unavailable to the plants.

Most plant nutrients are mobile within the plant, which means that older leaves show deficiency symptoms first, but Iron is non-mobile, so the plant can't move it to new leaves. Plants require iron for chlorophyll synthesis, and if it is deficient you get these chlorotic shoot tips.

Rotala spp. look to be really sensitive to low iron levels, and we've seen this quite often. Have a look at <"Rotala rotundifolia growth issues">, it is quite a long thread but it probably covers the subject fairly fully.

cheers Darrel

 

[heavenkid]

Thanks for ur advise darrel. Will read up the thread and add another supply of fe in to see how its goes.

 

[heavenkid]

Hi Edvet,

Ya, i restricting the nitrate. Hmm co2 not sufficient?

Flow is great. I using 2 canisters filter cum powerhead in this tank to ensure no deadspot.

 

[Edvet]

Ok, all plants moving in the flow?
( Not sure on the CO2, just from the pics the leaves dont look overly healthy, might be photo related)

 

[heavenkid]

Yes, all the plants moving in the flow.
I do agree with you, Edvet.
The plants do look unhealthy..
I wondering what went wrong.
Meanwhile will increase my co2 and see how its goes.

 

[Edvet]

MAke sure you dose EI ferts plenty and all micro''s, not just Fe.
Might want to throttle the Zetlight a bit back just to be on the safe side.

 

[heavenkid]

Sure. Will try it out and see whether the plants health will bounce back a not.