05-02-2008, 09:26 PM
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That's definitely not the right thing to do. Those fish are too large and territorial. They will fight constantly and inevitably only one will survive. Not to mention they will get large, and produce too much waste for a 75 gallon tank to handle.
You should try adding more decorations so that both fish have a chance to claim territory, and it will break up the line of sight so they can't always see each other. If that doesn't work though, you should really be prepared to rehome one of them.
Sorry if any of this sounds harsh! We're really just trying to help you, and prevent you from spending extra time, stress and money. Most fish stores are very profit oriented, so hearing them recommend more fish is not a shocking thing, however, it's not the correct thing. Also, most fish stores do not require their employees to have any knowledge of fish, or if so, very little, so fish store employees are not a very reliable source of information. Not that all fish store employees are uneducated, I know some very good ones, but their knowledge shouldn't make up for your own research.