Could I have an apisto pair?

I would love to do that... Unfortunately, in order to get the 125g that I have running, I had to break down the 55. In order to avoid domestic warfare, I can only have either the 36 OR the 55 running. Do I need to get rid of any fish if I move everyone to the 55?
 
No if you moved them all to the 55 the stock would be fine and you could still add the pair. I don't know much about the upside down catfish though, but grow to 4inches. I wouldn't add more than 3. Goodluck
 
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