I am planning on getting a 75 gallon tank for a snowflake moray eel. But I don't have space for a sump. Can I just use a fluvial canister? I heard eels are messy eaters, so I also plan on putting a hang on the back skimmer. Also, is using regular distilled water from the store good enough to fill the tank up? I don't have a rodi system, but I do have a ro system that will produce enough water to fill the tank back up for a water change.