What's missing ?

I have a 150 with 384 watt PC strip that is only 8 in. wide and 72 in. long. I believe this is to narrow and is the root of my problem (Ludwiga is green, Water sprite is brown, with a little hint of green) Its C)2 injected and I use the EI method. There is black and green Algae growing on the leaves and glass so I cut back on the amount of all ferts to starve the Algae out . I think more light is needed but would like other opinions please

 

The tank is 72x18x27 my light strip (6700K & 10,000K ) is only 8in. wide, thats why I think the light is not spreading out to allow for good growth. I do have a drop checker (Red Sea ) with 4 KH solution. PH is around 6.7-6.8 Pinpoint PH Mon. I have four in. of eco complete and an allglass top.
The fert amounts are as follows : 2tsp. KNO3 1/2 tsp. KH2PO4 1/2 tsp. K2SO4 and 75 ml. of plantex CSM+B 3x a week.
This tank has me confused , my other tank is a 110 gal.(48x18x30) it to has 384 watts and it has never had algea and the plants are doing well.

 

For the 150 I have one XP4 Rena and a Magnum 350. I use the Magnum as a CO2 reactor as well as a filter. I do around 40% W/C's weekly. I have 4 tanks so I skimp a little to save some $$. Newport PA. water is expensive NO,NO,NO, it's ridiculous.

 

My flow rates are XP4= 450 GPH and the Magnum is 350 GPH. I keep them clean so they continue to perform at their optimum level. I have learned over the past months that the CO2 and PH fluctuates quite a bit as the filters flow rates would drop. To prevent this I alternate the cleaning times of the filters every two weeks.

 

Tom this tank is a Perfecto,its 17 years old and only 18in. wide and 27 in.deep 6 feet long. I thought the light would work out well live and learn. I talked to AH supply about an idea and would like your opinion.

Using 4 65 watt 6700K and 2 96 watt 10,000K in a home made hanging canopy with the lights on timers that would allow for controlled WPG.

This tank has 6 huge Amazon swords full of runners and 12 assorted Anubia's, Water Sprite and onion grass how well does the EI method do for the root feeders ? I use Seachem root tabs every 2 months for each Sword. I ask this question to see if its possible that I'm adding to much of the ferts. They may not be used fast enough even with the 40% W/C's that it is allowing for the algea to live

 

I added a second XP4 and the sponge prefilters , a powerhead with the sponge base to help increase the circulation. I still use an airpump when the lights go out and the CO2 is on a timer. In this tank I have a large PH swing from 7.0 in the morning to 6.6 before the lights go out. The Watersprite has become a huge bush the Oniongrass and Anubia's have new leaves. The problem is the Amazon's. They have holes and turning yellow then brown and the current is able to tear them. The newer leaves look ok. I use Seachem root tabs. There is pearling on the Watersprite and streaming coming from the tears and holes of the Amazon's. I reference the pearling as I read it is a sign of health in a planted tank