Hi Imbarrie, thanks for the advice. The Aqua c 120 is my first choice, actually i would love to get the 180, but realistically l can probably just get the 120 or pro for this rodi unit. I am only considering the pro because i have some live sand that i picked up that has in a bucket for about 3 to 4 weeks. I am not sure if i should rinse or just put in empty fish tank being that most of the life might be dead? Thanks any feedback would be appreciated. Thanks