I have just finished cycling my second tank I have a 55 full of lake malawi. My other tank is a hospital tank and now my 40 gallon is ready to go I plan on moving the 40 gallon to 100 gallon in about 3monthe to 6months. I plan on getting a jack Dempsey, a Midas, green terror and a red devil....I will add an oscar or two when the 100 gets it going on........ Will these fish live together. I plan on gettin all to start under 3 inches. One other thing what cats can I put with them?