I recently bought a 120 gallon tank. haven't bought anything for it yet. The fish I want are:2 or 3 blood parrots that I know I want/ 1 or 2 firemouths. 1 convict. 1 flowerhorn, a frontosa, and a red severum. Would these fish get along? And also what gravel size should I get for them since I know they like to dig? I don't want sand