dwint said:i left the water in and kept the filter running.theres no need for filters,you just need circulation and keep your lights off.its hard at first but you will get tired of spending money on fish and different foods.i have one of those pet stores that dont even ask what size tank i have or what else is in the tank.they sold me a yellow tang and he lasted around 6 months but i only have a 75 gallon and like everyone says they need 100-125 gallons.its really easy if you just keep getting advice from books and live aquaria.you'll get it.good luck and be patient