Leaves On Some Of My Plants Are Turning Brown

[nightlite]

Hi
the leaves on some of my plants are turning brown (the edges of the leaves)
what is wrong...?

I;ve been dosing the JBL Ferropol as recommended and the JBL Ferropol 24 ferts.... something missing?

Help

 

[reiverix]

JBL Ferropol is just a trace mix. How are your readings for PO4 and NO3?

 

[nightlite]

JBL Ferropol is just a trace mix. How are your readings for PO4 and NO3?

and JBL Ferropol 24 is ...... ?

for my PO4 and NO3 ... i've no idea as I don't have the budget for those testers yet...

My substrate is JBL Aquabasis and my light are 2 x 24W PL
my ph is 6.6 and NO2 is 0 .... and I'm also running with DIY CO2

an example

 

[nightlite]

and another example

 

[nightlite]

uhu anyone??? thanks in advance

 

[RedShark]

If your dosages are correct and you still can't figure it out, try to reposition the browning plant so that more of the light will hit it.

 

[RadaR]

If your dosages are correct and you still can't figure it out, try to reposition the browning plant so that more of the light will hit it.

Agreed.

 

[nightlite]

If your dosages are correct and you still can't figure it out, try to reposition the browning plant so that more of the light will hit it.

Agreed.

if you see the plants in post#3 those are right in the middle....and should get the most light... for post #4 those plants are on the side.. ....

could it be iron deficiency?