I'm fairly new to corals, but as far as I know, you can add as many coral as you like at once. The only effect it can have on your tank, again as far as I know, is if you add a lot of sps/lps, your calcium may drop quickly, but just monitor and correct it.
I've done two orders to fragalot so far, 9 frags each time. Follow normal aclimatization process for fish, but make sure to dip your corals, as I have had a bunch of bugs fall off his frags. Remember to turn your lights down for the first couple days too.
Out of the 18 total I got from him, one sps , and one frag of Mohawk palys didn't make it. I don't know what got thr Mohawks, but the sps was definitely my fault for turning up the lights and mounting it high in the tank too quickly.
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