I have just purchased a black tiger oscar and currently his is about 2inchs long at the most he is in a 30gallon tank with a similar sized green serverum and i know the tank is two small for the fish as they start to grow and i have just bought a 70gallon tank for the fish they get along just fine and so far there diet is tetra prima chiclid pellets and they are doing just fine but my friend told me to put them into the bigger tank as soon as possible but i dont quite see the ponit in putting them into a tank that size when they are bearly the lenght of my little finger could you tell me when i would need to change there tanks to the bigger one please all advise will be taken into account thanks alot Tyler:)

I would put them into the bigger tank now. If you get the bigger tank up and running(make sure it is cycled correctly) And you add the fish although small, the bio loads will be way less. You will have less frequent water changes. not to mention you will not run the risk of stunting their growth.

I know it seems like over kill but they will be better off in the bigger tank now....

BTW welcome!

thanks alot for the advise and i will hopfully change there tanks over within the next week or two once thewater in my bigger tank has had time to settle down and let the tank be cycled properly thanks again Tyler

Just FYI!! It takes 45 -50 days to cycle a tank. Unless you run your cycled filter in the new tank and place all water from your existing tank into the new one!

oscar in a small tank never grows. they just die young.
so please put them in the bigger tank if already available.

three months ago, i had 2 x 2 pairs of oscars x 1.5 inches size,
1 pair was released in 110 gal tank while the other pair was
released in 29 gal tank. the two that were released in 29 gal
tank never grows while the two that were released in 110 gal
grows fast. when i transfer the two from the small tank to the
110 tank, would you you believe the other one was taken as dinner
by the one in the bigger tank, the reason i name him Gluton. as of
today, the remaining one is just as one fourth the size of Gluton
and stays with Survivor in my 90 gal tank.