When it comes to a pair of clownfish (ocellaris), is it better to buy a pair from the LFS and put them in at the same time, or buy one at a time and give the tank (and it's bacteria) time to acclimate more slowly.
Slower is almost always better in this hobby, but in this case I worry that the pairing may be harder than if they're added at the same time.
(additional note: I'm not entirely sure that the pairs at the LFS are mated pairs, but they do keep them in individual tanks with one bigger than the other and sell them as pairs, so they're at least suitable to pair up)