how much room for 2 pair?

To be truthful, no tank. I would suggest you use a 20 gallon "long" to breed one of the pairs and when they are finished, remove them and place the other pair in there. Then comes the problem of where to put the fry until they are large enough to go in the big tank or be sold. Almost all those who breed small cichlids keep just one pair in their own tank.

Originally posted by andruboz
of smaller peaceful cichlids..

the multispinosa and sajica. what size tank could they both breed in without killing each other? this pic is from the 125g but thats too busy a tank for them to raise fry in.

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I'll suggest that you talk to Trainer in MoJo's forum. He has more experience on them.