Just wanna bring this thread up again as I'm going to post the final update of this tank.
I left this tank unchecked for almost 3 months during the summer. No CO2, no ferts, no proper trimmings. I just let a friend of mine who has no experience at all with tank keeping to take care of this tank (feed the fish, add water). After I returned from summer holidays, I was surprised to see the plants still growing, but in very poor conditions (lots of algae). Then I start again with all regular maintenance in hoping to see this tank shine again. So here is the result after more than a month of rehab:
I'm not going with all the details. You can see it yourself. So, this is it. I'm going to tear down this tank and come up with another scape using Sado-Akadama stones. Maybe I should start another journal, with more regular updates (senior year is much more relaxing than expected. haha).