The oscar fish ... dark background. Oscars have a reputation for being aggressive, and they can be. It all depends on their environment, however. Oscars do best when kept in a spacious tank ...

and a specially designed background that allows the fish to be easily seen by residents who may have cataracts or other vision impairments. The units also can be moved easily from room to room.

When the sunfish began looking unwell days after the aquarium closed on Dec. 1 for a six-month renovation, its keepers suspected digestive problems, gave it less food and visited the fish tank to ...

All oscar fish have the same care requirements, but these varieties are guaranteed to make visitors want an aquarium of their ... winding over a dark blue background. The coloration is striking ...