I am trying to grow potted plants for my indoor tortoise enclosure. Can I use an organic/chemical-free/pet safe liquid fertilizer to help them grow better?

I made a soil blend of coconut coir, topsoil. worm castings and orchid bark (no perlite, vermiculite or pumice) and I am seeing almost no growth after a month. Would something like this product be safe to use? https://www.amazon.com/GS-Plant-Foods-All-Purpose-Essentials/dp/B0D6C1QYRW?ref\_=ast\_bl\_cpl\_dp