Rusty Cichlid comaptiblity question

Hi All,

I had 3 Iodotropheus sprengerae (Rusty Cichlids) in my Malawi tank.....two
have gone - one female I found, the male has just vanished...I guess there
must be some carnivores in the tank....I stripped it down...

The remaining female was very distressed and I expected a death
tomorrow/overnight without any action....

From my reading I understand that the Rustys are more peaceful than the
others and can become victims quite easily....rest of the tank contains....

4 Pseudotropheus Saulosi Juvs (sold to me as something else but still not
convinced)
2 Aulonocara Hybrid OB Peacocks
4 Maylandia Lombardoi
3 Melanochromis Cyaneorhabdos (Electric Blue Johanni)
2 Yellow labs
1 Snowball Plec

What I have done is move the remaining Rusty (she would have been dead by
morning I'm sure) into my ex-isolation tank. I've provided her with a
cave...the occupants are one betta, two platy fry and two otos....

Will this work.....I'm thinking unless for some bizarre reason it works she
goes back to the shop.....I don't believe I can put her back into the Malawi
tank...

Gill