ok so im planning on buying a 72 gallon bowfront aquarium, (im buying off craigslist, just need to see it in person before i make the purchase) im just trying to decide what substrate to go with... im going to be keeping African Cichlids, as usual. im not sure if i shoud go with a crushed coral, or some sort of sand or something...im trying to take more time and more of a thoughtful approach on this, becuase i really want to make this tank somthing that i will be happy with for a long time....hmmm what to do...