[180g]

idk. but a way to find out is toget the par of the lights.

 

[jeffkrol]

Hi, rather new to this.
In my 10 g tank with CO2,
and Marineland 18" LED plant light.
My hemianthus HC and Pogostemons have
Grown well,but recently there is a
Yellowing area down the center of the tank,
Looks rather burned out. Is it too much light,
or insufficient nutrients? About 65 days on tank,
Fixture sits about 1" above surface,10 hr light cycle.
Fertilize lightly seachem micro and PK.

Maybe you need to grow them right side up...

 

[Steve001]

Hi, rather new to this.
In my 10 g tank with CO2,
and Marineland 18" LED plant light.
My hemianthus HC and Pogostemons have
Grown well,but recently there is a
Yellowing area down the center of the tank,
Looks rather burned out. Is it too much light,
or insufficient nutrients? About 65 days on tank,
Fixture sits about 1" above surface,10 hr light cycle.
Fertilize lightly seachem micro and PK.

It could be because you are growing them upside down, like the other poster said or maybe because of an iron shortage.

 

[Daytona675]

From the Marineland manual, it's shows a PAR
Value of [email protected] a 12" distance,same as in my
setup, my ground cover HC grows well up against
The front glass,but is yellowing towards the center.
I also am starting to have thread algae problems in
that area.I'm going to back the fixture off 2", and see if it helps.

 

[ChadKruger]

From the Marineland manual, it's shows a PAR
Value of [email protected] a 12" distance,same as in my
setup, my ground cover HC grows well up against
The front glass,but is yellowing towards the center.
I also am starting to have thread algae problems in
that area.I'm going to back the fixture off 2", and see if it helps.

I am no expert but from what I've personally experienced is you're have a nutrient deficiency. With that much light you need to do a solid EI dosing. The thread alage sometimes comes from plants leaching out nutrients when they are dying.
You didn't say what your substrate was. Is it inert? Ecoplus?

 

[Daytona675]

The substrate is Carib Floramax and a little bit of laterite
on bottom.I was kinda following the startup procedure
outlined in the Tropica app. Just started with
full dosing ferts yesterday, they had recommended
only using 1/2 dose micro and K,and no N or P until now.
Thanks,will see where it goes.