Staurogyne Sp

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So I have a 55-gallon tank and fresh water was going to plant it. This will be one of my higher maintenance and that is why I need your help.
First, here are the parameters and specifications of tank:
Temp: 77F
PH: 6.7
Lighting: 2x 65 Watt Hagen lifeglo compact fluorescent bulbs (8 1 / 2 hours)
1x 28 Watt Aqualight (9:00)
Substrate: substrate Aquariumplants.com complete
Water changes: 15 gallons per week
Filter: Marineland C220 filter housing (225 gal / h)
CO2 1bp5s (one bubble per five seconds) Half a cap of Flourish Excel week.
Nitrate: 4 ppm
Nitrite: 0
Ammonia: 0
Fers: Trace elements added each week, iron root tabs added weekly, every two months.
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Plants (Go back before I have a few rocks and driftwood)
HC
Dwarf Hairgrass
Downoi (Pogostemon helferi)
Staurogyne sp "Porto Velho"
Anubias nana small
Narrow leaf Java fern
Mermaid weed
Rotala Indicia

Thank you for the research, while trying to balance my tank!

This actually seems .. great
my 2 cents is, go to change Watter 50%.
It will be much more effective.
It will also replace the trace elements per week.
You can then add the fertilizer Flourish instead of the trace.
In addition, with the CO2 you do not really need Excel.
I have used in the past and has actually made my water cloudy.

I have 65 gallons ..... ...... please can u help me .... that everything must be done .... pleaseee ....
I am new and interested in what ?????????? Feild