Algae on plants Dosing EI with CO2

My tank has been running for a little more than 2 months. I still have some algae on my plants.
My water is clear and I do 50%WC every week.

Question. When I trim the tips of my plants the lower part of the plants have some algae and they don't look as good as the top portions of the plants. Is this normal? I would think so because they're not getting as much light as the tops of the plants. Did I just answer my own question?

My CO2 is 29ppm My light is a twinstar 900s I'm dosing at half the Ei amount for a 40 gal tank.
The light is on for 6.5hrs a day
The CO2 starts 1.5 hours before the lights turn on and it shuts off 1 hour before the lights turn off.
My amounts are as follows.
Macs
7.5 mil 3x week KNO3 = 3.7525ppm NO3 per dose.
7.5 mil 3x week KH2PO4 = 0.661 P ppm per dose.
From both of these the K = 3.193 ppm per dose. Question: Should I be adding K2SO4 to increase the K since I'm not dosing the full amounts?

Mics
10 mil 3x week CSM+B = fe 0.2002 ppm per dose. Question: I've read a couple of articles that say the target fe should be 0.5ppm?

If I've left any info out let me know.
Thanks every one..

 

Ok fablau, my substrate is Fluval stratum, it's an open tank, my filter is a Fluval 70 hob. I do have an Eheim canister that I'm going to use soon.

My ph is 7.5 then it drops to 6.4

As far as measuring the CO2 I'm just using the liquid test kits and that's what I come up with. I know that's not the best way to test it. But the numbers I'm getting have been consistent, if that means anything.

I also use a power haed and a in the tank filter.

 

Hey Greegz, I agree about the tester.

 

I'm using 1 900s. If this is considered a high light then should I increase the ferts?

 

I'm using the 900s which is brighter than the 900es. I think they said it was 50% brighter than the 900es

 

Thanks, glad to here from you Tom. What is the most important thing when growing plants?

 

The ph was 7.2 right before the CO2 turn on and 6.4 just before the CO2 turns off.
My camera just died, so no pics for now. I have some algae on my Belem grass, mostly the older parts. I also have algae on my Alternanthera reineckii. And I can't seem to grow Staurogyne repens. They just melt away.

Also, if the light I have is a high out put led then why do I have problems growing any thing like carpeting plants or grasses?

As soon as I can get my camera fixed or buy a new one I send some pictures.
Thanks for the help every one..

 

Ok, I was able to fix my camera and these are a few pictures for you guys.
As I said before, you can see the algae on the Belem grass and the Reineckii mini. The algae on the lower leaves on the mini is what's left from the early stages of the set up. it doesn't seem to be getting any worse, but I can't seem to get rid of it.