TODAY i went to my LFS and exchanged my 5 inch tinfoil for two rainbow`s one crimson ( call him pirate) and one boesman`s ( boss) maybe (the boss?). I put them in the 30 gallon tank with the arrowana.Ihope the will surrvive.
Oh yes the tinfoil was constantlly fighting for the food. ???
So then rehome the arro, there is literally no excuse for that. At all. Unless you plan on throwing a 200 gal tank out there any time soon. You shouldn't have gotten more fish either, just return the tinfoil and leave it at that. Rainbows need schools of 6+.
It doesn't really matter about it looking good, if the fish are cramped you need to return them. Unless you can get a bigger tank for the arro and a school for the rainbows you should restock the whole thing, probably with some tetras, danios, livebearers, shrimp, snails ect.
I agree, there's no reason to get more fish when you're already cramped for space, plus you got two schooling fish, and two different types! If you don't want to return the aro (which would be optimal) then I would definitely return the rainbows.