I have a 75 gallon tank and I just bought and am hoping to recieve my Reverse Osmosis filter by monday or so. I bought a 100 Gallon Per Day filter. I was curious if this is good enough to leave hooked up to my fish tank and will do the job in softening the water. And also would i be better off hooking it up to the sink and just using the water for water changes and then adding in the trace elements needed since the RO filter would probably remove all the elements. Thanks in advance you guys are great.