05-07-2008, 08:33 PM
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It's normal for fish, even territorial ones to hang together when they are nervous. My friend kept 1 male & 2 female red-eye puffers with a pike. They spent most of their time together, for safety. When the pike grew larger and was moved out, the male quickly became more comfortable and killed both females. Not that your oscars are going to do that, just exemplifying how even territorial predators will give that up for safety. Obviously your fish will realize that they are safe in their new tank.
Your aquarium does look pretty bright, and there aren't many decorations, especially past the bottom level. You may want to add some more decorations that are taller, so that they will explore more levels of the aquarium, and also more places with shadow, etc. for them to feel sheltered in. They love to dig caves under pipes, rearrange decorations, etc. Anything they can move around, they will, and they'll be very happy about it.