Bill discuss tanks are probably the hardest as far as freshwater is concerned and then you throw in plants and its just makes it a bit more harder.

I've kept many African, South american and Central American cichlid tanks in the past. I have to say Africans are probably the easiest and do well in our Hard city water. However, I do not think a 100g tank is large enough for a frontosa tank. Would make a great Mbuna setup or a all male peacock tank.

good luck on you search for a tank.