Introducing Small Fish With Big Fish Help

So my aquarium stand broke. Dog jumped up and knocked it over. And my 120 tank cracked. My 75 did too. So I got a 200 gallon. Used my already cycled media added my 5inch Oscar my 6 inch female pink jack Dempsey. And my 4 inch unknown African cichlid. Everything is good. But. The other fish went into a 30 gallon I had laying around. 2 convicts. Breeding pair. Maby 2inches. A small Victorian hap maby 1.5inch or 2. And my 2 inch male jack Dempsey. But my problem is now my convicts spawned and the small jack and hap are getting chased. Not beat up but hiding in the corners. I want to put them in the big tank while the convicts baby fry but I'm afraid of what might happen. Will the big jack or Oscar eat the small jack and hap? I'm not sure if the Victorian hap can fit in the oscars mouth. I don't think so. But I'm afraid if he tries it will kill him from choking on it. How can I introduce them? Or is it best to let them in with the convict pair who are extremely aggressive with fry right now. I can't get another tank for about a month. Do to business situations. Any help would be so great

 

Can you make a tank divider for the 200 gal until you get things squared away ? I made some out of these :

 

A 5" Oscar will try to eat anything 2" or less. A mated pair of convicts will most likely damage or kill they're tank mates in your 30 gallon. It's called the rock and the hard place! I'd move the mated pair of convicts to the 200. They're eggs or fry will be eaten, but in a short time they will mate again, and you will have more convicts than you will ever wanted.

 

The convicts are small too. The female is maby 2inch. The male is 3.5. I think the male will hold his own against the big Oscar and big jack but I'm afraid the female might get eaten. I could put a small divider in alittle area for the jack and small Victorian hap. I'm afraid they might not grow fast enough to keep up with the Oscar. He grows so fast.

 

Also agree that the divider would be your best bet at this point