You've only lost what, $50 worth of livestock so far?
I'd take everyone here's suggestion and 100% re-fill after you get an RO/DI unit. You will LOVE it later knowing that everything is OK starting point wise.
It's one of the smaller purchases in the hobby and if your LFS is smart they'll agree it's the best way to keep things alive (ask what they're using, I bet it's not tap water that's been through a softner)
Don't be discouraged by the set back, getting the right kind of equipment now will save you major headaches down the road, and an RO/DI unit is dang near a requirement for those in water treated areas.