very true they are a bit fast. (love to see if my male swordtail would beat one in a race) probably disturb the oscars dosey time lol 125g tank would be big enough though wouldn't it? thats around 560 litres. depends on the size of the tank a bit.
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first of all with cichlids its a chance your taking. 2nd, every cichlid doesn't also require a certain amount of gallons to be comfortable, like other fish, but also a certain amount of area in the tank(usually the tank floor or substrate). large cichlids usually require a lot square footage as far as territory. i know its not really cool when you have only 1 big fish and nothing else in the tank. but sometimes thats what a fishkeeper is faced with. do you you take a chance(which could or could not work) or do you give them their requirements. sorry for saying it straight out, but i thought i would save you some time, money, and loss. but if you indeed have a true pair of oscars, thats something good and awesome which you can definately accomadate in that size tank. its like that saying= 2 is company and 3 is a crowd. watch your fish closely, and you will see what is needed in your tank. no matter what, i hope it works out well 4 u. would love to see some pics of those big, beauiful oscars.