Typhon hydra mechanics

I’ve just started messing around with the new typhon set and have a couple of questions. It seems that once I have two hydras out, that my channeling will not pop another one and I have to put down the next one manually. I’m guessing this is how it is meant to be, but thought I’d check. Also, it seems that the frost hydras, while fairly powerful, have a pretty short damage range and I’m constantly setting new ones closer to the monsters. Again, I’m guessing this is normal, but being new to the set, figured I’d make sure I wasn’t missing something. In case you look for my profile, my wiz is on my Europe profile. Thanks!

Yes this is intentional not move your Hydra’s around or to make it easier to maintain max heads on them.