Tank is a 100 gallon plus a 20 gallon sump and various pluming and reactors so water volume is about 100 gallons. I used 1.7G which is just over recommended 1.5mg/g dosage. I am waiting for the lights to come on so I can see how things are looking as I am about 18 hours in. I had the white/clear weby hydroids and also some green colonial hydroids so hopefully they will both die off. Not really sure how to tell if the white weby ones are dead or not though, anyone know? the green colonial ones should be obvious as they won't open.I'm most interested to see if it eradicates your Vermetid snails. I see it's a 100 gal tank but what is your total water volume and how many ml of Thomas lab Fish Bendazole powder are you using for your treatment? Keep up posted!
On a side note looks like my green and pink Kenya trees are not liking the treatment, but hopefully they will make it. Here is a pic of my tank before treatment, as you can tell the hydroids has almost completely destroyed the candy cane colony on the bottom left of the tank :