ok so i have a 20g long and i would like to either do apistos or rams......apistos are alot harder to find in my area. i have seen 4 diff types of rams..german blues, bolivians, golds......and i guess it was a german blue but it was veil tail and rather round looking like a parrot cichlid. so i am wondering how many rams i could do in that tank. i would like to have some of all types to make it interesting, also i was wondering about adding a school or cardinal tetra??? is this doable if not i will go w/ just rams. also i was told they like kinda darker substrate, and slow moving water, also i think they like there ph around 6.5......i may try to do some plants but i'm not really great at keeping plants alive in tanks.