i have breed my gt's recently in a 30 for lack of space being the reason my male is 4 1/2 inches and the female 3 1/2 i have another pair in a 55 and another in a 75 i deffinatly would reccomend at least a 55 for a small pair...... the project you are working would require 3 good size tanks...... your pair..... the grow out.... and another future pair the electric blue project is a very longterm difficult project... if you dont have ca/sa cichlids down and all kinds of equipment and space to run theese guys i would reccomend trying a smaller project