i have a 120 gallon tank with two oscars, 3 blood parrot, 3 gold severum 1 green severum, 1 big pleck, 1 corydorus. They are all amazin, and very colourful, the oscars make me laugh cos their a typical couple, they lie next to each other, they follow each other round, then they have little couple brawls now and again,i love all the fish, and their is only petty fighting once in a while in teh tank.

However i also have a silver arowana in a 15 gallon tank, the reason its in a small tank is cos i got it at about 5 inches long, its been 4 months of owning him and he is only seven inches, i dont want to put him in the big tank for fear of him being eaten, but he just doesn't grow!!! what should i do?

(this sunday i'm buying a troop of about 8 corydorus catfish for the big tank, to give the lone one some company!

thank you
x

Welcome to the site.

I've never kept arrowana before so I couldn't tell you how quickly that growth rate is. However, these fish can easily reach 24 inches in captivity. Unless you are going to get a much bigger tank, it's going to be very difficult for you to keep the arrowana.

I agree with OFL, even if you put the arowana in the large tank it will out grow that as well. your well stocked there and adding anther fish that will out grow all its tank mate isnt going to work. You have 2 options as far as I see. Buy a much larger tank for the arowana or rehome it with someone that can look after it. i think you will need 300+ gallons and possable much more. I would love a arowana myself but dont have room for a 500g+ tank that I think a fish of that size needs. good luck

PS you say your adding more cats?? do you test your water for ammonia,nitrites,nitrates?? how are you coping with water changes.

baisicly huge filters, weekly water changes and constant water check, the cats are only small their fine, i'm confident that the arowana will be ok with me until im ready to get a bigger tank, i just wish it would grow! water parameters are fine, nitrates o nitrites 0 ammonia 0 ph 7.0, tank used to be overstocked because i had 8 parrot fish 2 huge dollars and another oscars, but i rehomed alot

thanks for the advice

single arowana & 2 oscar can co-exist in 1 tank perfectly.
however, since both is a fast growing specie, time will come
that they will outgrow your tank. moreover, you need to take
precaution on tank lid to avoid arowana to jump over the tank.