Seachem Fourish Question

So..this may be a dumb question, but I’m new to live plants. I recently bought a banana plant, java fern, and anubias for my betta tank. Is it okay to use SeaChem Flourish with my betta in the tank? Is it harmful to fish at all? Thanks

 

Flourish will not harm your fish.

 

Nope, not at all, or people wouldn't buy it