all my tanks are run with recommened kilo of l.r and a skimmer,and sump tanks, one in pic above is 20gal nano tank ,28x15x15 which i use for frags, 15kilo l.r 2nd tank has my corals in and fish 39x20x22 30 kilo l.r 3rd tank fish only has 2-3 corals in 84x24x24 50 kilo l.r if your ever up this way ,more than welcome to pop in and have alook amones yup hard to keep, most of the success is keeping the water right.. yup my gal going for its mot in the morning ..... :lol: