Is 0.1grams per 10gal the correct dosing for the Safe Guard 4 Canine Dewormer?
Yes. I modified my dosage based on this guideline (might have overdosed a bit) for my 5 gallon with microrasboras, ramshorms, and otos and it got rid of all the hydra after 3 days of dosing. None of my fish were harmed and the snails were okay.
I've noticed hydra in my tanks every now and then throughout the years, but they never seem to stick. I tend to feed pretty lightly if that has anything to do with it.
I get bursts of them now and then in my shrimp tank if I over-feed (along with lots of other creepy crawly critters) and I've seen an occasional one floating free in my 37g, but can't say I've ever lost any stock to 'em. Though with the way cherry shrimp and endlers breed, there could the occasional loss that I never noticed. My pico tanks--which are stocked from the affected tanks--have never shown any hydra ever, but they're also incredibly lightly fed.