I have tried the small container pond many times and, while they look nice, I have found that they aways become the home to many mosquitos who then seem to want to feed on me. Again only my experience but the only way I have found to deal with it is to have a "proper" pond and have fish in it which will eat the mosquito larvae. I have got goldfish in mine, received wisdom is that they will eat the spawn and tadpoles of native species, but until we got the redleg virus here, we did well for frogs.