Organic potting mix or soil can be safely used in freshwater planted aquariums. They contain an abundance of beneficial nutrients for plants.
Introduction to planted aquarium substrates - The 2Hr Aquarist
Can the regular garden soil with a layer of gravel over it be used as substrate for a planted aquarium instead of the regular aquarium soil? - Quora
My experience with potting soil in a planted tank!!!! : r/PlantedTank
Guide To Planted Aquarium Aquascaping - Rescaping and Replanting - Glass Aqua
Step-by-Step Guide for Setting Up a Planted Tank
Quick Guide: How to Plant Live Aquarium Plants in Freshwater Tanks – Aquarium Co-Op
How to prepare potting soil for tank? : r/PlantedTank
Tips And Tricks For Dutch Style Aquascaping
Aquarium CO2 - How to add CO2 to your aquarium - Help Guides
9 Common Planted Aquarium Mistakes to Avoid — Buce Plant
How to Fill Your Tank Without Making a Mess! — Sunken Gardens
Complete Guide For Setting Up Your First Dirted Aquarium
Best Methods For Preparing Organic Soil For An Aquarium
Hemianthus callitrichoides (HC Cuba) Aquarium Plant – An Aquascaper's Challenge - Aquascaping Love
Substrates for a Planted Aquarium