ThriveS Shrimp Specific All in One Aquarium Fertilizer – 500ml Liquid Plant Food – Comprehensive nutrients – Aquarium Nutrition – Convenient to Use – Concentrated Aquarium Plant Fertilizer

Thrive is the brand and it’s one pump per 5 gallons. You can buy it on Amazon or their company website. Here’s a link. It’s not cheap but lasts for a long time I rarely have to use mine. https://a.co/d/0dwwdbTk