I have a 29 gallon feeder tank that is connected to the 50 gallon octo tank. It is also divided in half with a tank divider so I can keep crabs and shrimp separate. I know a lot of people are against having feeders + cephs in the same system, but for my situation, the pros outweigh the cons.
Cons:
-You need the space to set up two tanks near each other.
-Feeders are messy and can die and foul the water, increasing the bio-load.
Luckily I have it set up where the sump+feeder tank is in the garage and the octo tank is plumbed through the wall in another room.
I also bought oversized filtering equipment to compensate for extra bio-load.
Pros:
-Increased overall water volume, which in turn increases water parameter stability, making it a better home for Dr. Pus.
-I can bring back live crabs from the beach and keep them that way thanks to the cooler temps that the chiller provides.
-The stable conditions provided by the octo life support system also does good for the mortality rate of the feeders, therefore further eliminating con #2.
Hope this helps somehow~
Good luck!