your KH is on the high side a good KH reading will be 4-6. Gh has nothing to do with planted tank more on breeding purposes(thats why got it for apisto tanks). I assume your tap water has a higher ph like 7.8 or 7.9, a good way is to use RO water and mix with tap water to bring the ph down rather then to pump in excessive CO2 you might risk Co2 poisoning to yout fishes.
Dumping in excessive nutrients will not bring the plants any good but promote algae. good nutrient control is critical. BTW: stem plants are one of the most easiest kind of plant to grow.
Your foreground plant i've seen is to be HG, many forumers including me are not very good in keeping HG, problem arises due to insufficent circulation among them which causes particles to settle permanently.
Ferns,anubias , mosses don't need high light to trive they actually do better in low lighting.
Plants such as blxya japonica , crypto. balansae will melt under strong lighting so IMHO you might want to play around with the setting up.
If i were you i will have put in more base fert.
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