In terms of pros vs cons, which one would be better for my aquarium? or can i even get both? i wanted to get a few in order to keep my tank a little bit cleaner. i dont think thqat any of my fishes would get bothered by any of them. but based on how long they live (and breed) and how effective they are at cleaning, and how hard it is to take care of them etc, what would you guys suggest i get?