thanks everyone for your input - it is all very helpful. yes, i know the hippo will get big but when he gets too big i will trade him out for a smaller one. i sort of agree with the last poster who said that a neon goby and a clown goby really don't take up much room. I have about 15 narssarius snails, many hermits and a sand sifting star to take care of the detritus and i am meticulous with water changes. i soak all the food in selcon and also use kent zoe for vitamins so i am hoping the current mix of fish will all work. That said, i really do appreciate everyone's input even if somewhat critical. I love these forums and keep an open mind to learn as much as i can.. thanks.