There is nothing antibiotic about a reef tank, even a brand new one. If we take water bacteria concentrated into water in the package bottle, then input it into a larger heated body of water, nothing happens to the bacteria that were adapted to living in water
They weren’t going to starve in the bottle for up to a year or more, and that’s a sealed and sterile monoculture package. A reef tank is opposite: open topped and full of contaminants and trade feed sources.
The tank becomes like a giant bottle of fritz. Natural contamination feed is too slow to feed much activity only ten days in, but some degree of natural food is always present in any home aquarium setting and Fritz doesn’t fail to carry bioload when it’s added to a fritz cycle. If the op adds some fish now, they’ll be fine which is the outcome of all searchable fish-in cycles I’ve ever seen in reefing. Waiting till day ten to test load the bac isn’t a problem. If it was dosed into the tank then not fed for eight hundred days and then load tested, it’ll still pass and in fact the entire system will be fully cycled like a well-fed cycle because that much wait time plus contamination input is fully fed many times over.
