I currently have a 250 liter bow front set up and it houses 2 red tiger longfins. These are the most unique fish. Rocky will take food sticks right out of my hand. Bullwinkle is very reserved, he only likes my wife. Every time I try to feed him he splashes me a good one, so the wife feeds Bullwinkle.
My friend Wes has a 200 L tank with two oscars in it. One red and one tiger. These fish have the largest personalities anyone could imagine. He has too small of a filter though. He only has a 450 external filter to clean after two, large, male oscars. His fish have a serious territorial problem and almost constantly fight for right over the tank. One of his oscars is extremely agressive, while I was cleaning his tank it got ahold of my thumb (I thought I was a goner). Oscars are moody but are really cool fish.
Everyone of these fish has a different personality. I have two Tiger oscars with a male green terror. My larger oscar nearly killed my female green terror (which is a lot smaller and now in a community tank causing trouble). Well some of these fish are highly predatorial. My smaller oscar is more passive and hides behind the larger one a lot. My larger one acts more vicious than a piranha attacking a large goldfish. (I have seen a lot of piranhas attacking fish). When I drop a gold fish about 1/3 the size of the oscar in the tank, he immediately charges it and starts biting it and attacking it violently. He is extremely fast during attacks and totally massacres the goldfish. He ussually rips pieces from it, then its tail, then he bites its head off. (If the gold fish fits in his mouth he swallows it). It is so awesome watching it, scales and pieces of meat float around the tank. He is pretty peaceful other times, just swimming slowly in the tank, he doesn't pick on another fish unless they get in its way.
I have a real young pair of aggressive Red Oscars. They´re only 5 cm long and pick on my 8 cm Red Devil and my fully grown female Convict Cichlid. Oscars are great overall and I think everybody who's ever had this fish agrees they´re THE BEST FISH! They´re just like having a pet dog but in water. They eat a LOT! They´re great pets.
I loved reading all of other Oscar owners´ comments. I have 5 Oscars: 1 albino tiger, 2 regular black tigers and 1 common Oscar, also an albino ruby Oscar. All of them are spoiled rotten and I love watching them. Everyone says not to have live plants because they will dig them up, but mine dig up the fake ones too so don´t be suprised by anything they do.
I think Oscars are excellent fish. I have 2 of them in a 180 liter bowfront tank and within a couple of months I will move them to an 300 liter. They are very messy eaters...that tends to be their only drawback. They are wolves in sheep's clothing, they greet me happily at the top of the tank, but they try to bite me while I siphon the tank. I will have 2 Marineland Emperor 400's in the new tank, I believe that can cope with my messy Oscars. When I feed them live fish, they won´t let the minnow within 3 cm of the water before eating it. Sometimes they go for 2 minnows and get 2 in their mouth at the same time. Sometimes one of the minnows will get out of one of their gills!
I believe every one of these comments about the oscar. I happen to have a year old oscar named 'Jaws'. I decided to name him Jaws after watching him eat live food. His favorite live food is feeder goldfish. As soon as I would put them in the water BANG he would attack them. It is amazing how fast he sucks them in. When I first bought him he was teeny tiny. I had a red bellied pacu that was twice the size of him. Now my oscar is bigger than him. When you have an oscar you really have to watch the ammonia level because they´re heavy eaters and pooers. I really agree about oscars having lots of personality. When I go in my room he looks at me through the glass and follows me. When I feed him he wiggles his fins a lot faster. I did have four oscars with a jopoke, but the jopoke killed all but this one so I decided to get rid of him. Jaws is the prettiest tiger oscar I´ve seen. Oscars are the best kind of freshwater fish you can have in a fish tank.