I'm looking at buying a used tank and I have a couple on my radar. 55's seem to be everywhere but I'm debating if I should go for the 75 instead. This will be my first tank since I was a teenager so my fish skills are a little rusty. Anyways, based on the fact that a 75g takes up about as much room as a 55g is there any major advantage with going to the 75g? Obviously I can put more fish in but will there be a distinct limitation on a 55 that a 75 won't have?