Angelfish problem

[pogfish]

Hey, I Recently brought two new koi Angel's and I knew what would happen but I decided to buy them anyways. They are small and there are 2 of them, and I decided I would let them grow out in my 20 gallon tank with a six to eight month angel. then he got aggresive and was chasing and nipping their fins, I then got some plastic and divided the tank in half, but I dont think it will be very good in the long run. I have another 52 gallon tank however it has one bigger angel in it and I'm pretty sure in there they would be dead meat. Is there any other solution to this mess other then buying another tank, if not I will have to buy a new tank.
Sorry for the sloppy writing.
Regards pogfish

 

[jake37]

I would try putting them in the 52 and see what happens. Also a 20 is pretty small for a 8 month old angel. There is a chance that a fish in that size tank could become stunted.