I used these instructions:
Our PPS-Pro Fertilizer Pack Ö Just Mix & Dose | Planted Aquarium Blog Ė Green Leaf Aquariums
Just increase/decrease based on the size containers you're using.
Also - you may want to check your nitrates, and if they're plentiful already, then don't add them (or add them at a lower than recommended level). Rivercats recommends putting them in a separate container so you can independently control them (test weekly).
Same thing for the MgSO4 - if your water is already hard enough, no need for these at all.
OH! Remember to use distilled or RO
water. I even store mine in a dark place so that nothing grows in them.
Size: 55g Filtration: Whisper 60HOB, Fluval 306 Lighting: buildmyled 48" LED (6500K). CO2: CO2 injection. Fauna: 2 otto cats, 2 cherry barbs, 4 phantom tetras, 4 amano shrimp, 1 red tail shark, 6 lampeyes, 10 red + 10 black crystal shrimp, 2 apple snails, 7 checkered barbs, 2 bushy nose plecos