Hi nice setup. I dose with ADA's ECA for my red plants and it works great. I also do not think you need to dose if you do not have any plants yet. I did the same water change reg, with ADA's products and within 2 weeks I had perfect water parameters to add fish. I also use Pfertz products like yours and use one pump of each 5 days a week, 2 pumps after a water change. I now do water changes every 4 weeks and my water is crystal clear. The filter is the most important factor. Keep up the good work.
P.S. Try to center the tank under the light somehow and cut the end that is hanging over about 4-5". Sorry, I have a close eye to detail. :-)
FACT: If you do not have a passion for what you do in life, be it your career and/or your hobby you will not be successful. RIP Dad (1/12/12). I love and miss you.