hello everyone i am completely new to saltwater aquarium but i have decided to use the 90 gallon tank i used to keep freshwater fish in to house a saltwater comunity. I know that i have to research this a lot and everything so you will have to excuse my lack of knowledge but im very confused with everything i have read about equipment that i need.underneath the tank i only have draws and not a cupboard so i can not store a filter that needs to be stored under the tank.from this i gathered that i would have to have a fish only aquarium but i still am unsure what filter i will need with this.would it be possible to use a power filter that just goes inside the tank like i do with the salt water tank?what else do i need?does it look hopless for this conversion to happen?