You have to be careful picking out a new fish for your marine aquarium. The last thing you want to happen is to take your new home and it becomes sick due to a disease or something else that you could have identified at the store.  There are a few things to watch for that will give you an indication there could potentially be a problem with a fish.  These indicators to watch for are both in the appearance of the fish as well as how the fish behaves.

Selecting a healthy fish is not a hard thing to do but it does require patience and restraint.  If you are not 100% sure that a fish is healthy , it would likely be best not to buy it.  The below are the basic rules of thumb that I follow.  Keep in mind, following a process like this can never be 100% safe or 100% accurate, so you should still quarantine new additions before add them to your display tank.
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