my first sump (65 gallon and 25 fuge)has my protein skimmer, water top off, and ca reactor, i am running bioballs but i would like to start taking thease out. Theother sump and fuge i made just to help filter the water better, i made 3 compartments so i can try diffrent types of calurrpa or mabey clams, i am still new to salt water i just want to learn. i will eventually upgrade to a bigger tank, becasue i have learned plenty of donts in my first few months of salt water. like dont have carpet within 100 foot of a tank, and i need a house just to put all the fish stuff in with plenty of room.