I've been dosing aqua carbon every day for the last week or so, i have a 125l and i do 5ml a day (bottle says 5ml per 250l) to boost growth and now onto 2.5ml roughly a day. The plants and fish are fine and i have noticed that since dosing the AC some plants which weren't doing very well before have started to create new shoots (my cabomba has started to grow properly as well as my rotala indica which completely died before the AC). I have no co2 so i find the liquid solution is far easier especially for people like me who has only been doing the hobby roughly 3 months.
Unsure about their own brand ferts but i've been dosing 3ml a day of Tropica plant nutrition plus, just dropped down to 1ml a day