Same thing. I use this and get it from Ebay. It seems to have a more active ingredient. My own rule is .1g per 10 gallons for planaria, or .05g per 10g for hydra. Turn off light as it breaks down in that, and dose once and if needed a second time 3 days later. Some people do a water change after that. It's 250mg per packet, so just pour out the packet and cut it into equal piles for the .1g . Careful though, your partner may think it's cocaine. LOL: