My tank is about nine months old - 13g 16" deep with chili rasboras and cherry shrimp, Flourite substrate with root tabs and a Fluval Plant 3.0 light. It has a fair amount of established plants: anubias, java ferns, red flame swords, dwarf water lettuce and hitchhiker duckweed. I mysteriously killed a few supposedly easy plants over the last several months, within a week of getting them: java moss, christmas moss, guppy grass, jungle val. I recently added my first plants that need higher light: scarlet temple, microswords and Hydrocotyle tripartita 'Japan', and I want to make sure that I'm giving them enough light to grow (or at least stay green and not die) while not encouraging too much algae growth. With the shrimp I'm not worried about most algae types, they'll happily eat it, but they don't eat BBA and I have a tiny bit of BBA already on the leaf of a java fern that's below the filter outtake.
What settings should I have my light on to give the higher light plants enough light? I think this light is capable of high light in a tank this size, isn't it? And how often/how much should I dose fertilizers (I currently do two pumps Easy Green twice a week, one pump Easy Iron twice a week, 2.5 ml Flourish Advance once a week) to keep up with the higher light so that I don't develop an algae problem?
Also, I have my scarlet temple not properly "planted" or buried in the Flourite, they're just sitting on top of the substrate with plant weights wrapped around the bottoms, because I'd read they're mostly water column feeders - is this okay?