Thickskin 'Obliquidens'; 'Redtail Hap' Astatotilapia sp. 'Thickskin'
This vibrantly colored cichlid from Africa's Lake Victoria begin showing off their rainbow hues at a young age. Males can grow up to five inches (with females staying significantly smaller), so be sure to provide enough space for their size and cantankerous nature. They prefer alkaline water and a varied diet, which will help them develop their bright colors to maximum effect.