I just got my 42 gallon aquarium a few days ago and it's great, have already added my angelfish,zebra danio, and my 2 plecos from my 10 gallon. The problem is that my big cichlid and my small cichlid that I left in the 10 gallon are so awsome looking and would love the big holey limestone rock I have in the 42g. I will probably not be able to stop myself and will add them anyways since they have already co-existed with the other fish that are in the 42gallon for a long time, it's just that im not sure how they will act to the other fish i plan on putting in the 42g. Any advice as to what any of you would do?