Oscar + Arrow may also be an issue... I agree w/ nixing the Oscar altogether. unless you get lucky and get a laid back one. And what are the tank dimensions atm? they can make a difference of how long those fish will be happy in that size tank. and expect 1"+ a month or more from the TSN, and Arrow. Where the BGK and CL's will grow at a much slower pace. and the TSN will likely not play nice w/ the CL's and BGK once they get larger, and likely will predate them.
just isn't economic for me) I would rather have a humongous tank for multiple bad-A fish 