Eco-complete alone is fine but it puts more emphasis on the use of root tabs. Eco-Complete will collect minerals and nutrients from water column dosing as well but tabs will be necessary for stemmed plants.
I personally used Miracle Grow Potting Soil (about 1-1.5" deep) and capped that with another 1-1.5" of eco-complete. Root tabs, I found, were less necessary.
Also, if 75 PAR is accurate, then you will indeed be pushing the medium-to-high light boundary. If you're not heavily planted, I think algae problems are almost guaranteed.