Alsie, I use an ecosystem setup and I love it, very low maintance. Though I did run into a few problems in the first year (I think due to inexperience) but I'm in year three now and its doing great! I think that the most imortant thing to remember about having an ecosystem is to try not to put any additives in the tank if you can help it b/c since you don't have to do a water change but about every 3-4 months or longer, there is no way for them to be filtered out. Also be carefull on chosing your inhabitants, everyone should have a job in the tank if its going to be self reliant.