Anubias and Java Ferns don't really need much fertilizing, the PH of 7.6 really shouldn't affect them much, as my normal water PH is right around there as well. I would NOT use house hold plant fertilizer as 60%-70% use urea as the nitrate source, I would just get a bottle of SeaChem Flourish Comprehensive and dose the tank once a week...
If you decide to add more plants to the tank down the road I would invest in a planted substrate like Flourite, and then up the amount of flourish you're dosing to the tank.
For plants like Anubias and Java Ferns they do best when attached to something like driftwood, if you bury them then they'll die off so worries about "fert sticks", if you get root feeding plants down the road that need to be buried in the substrate then I would with aquatic root tabs that you bury in the substrate for the root feeding plants.