started with 50 gal, then added a shared 30 gal (share with brother), added a 20 gallon, took down the 30, took down the 20, kept the 50 running at my parents, now have a 75 at my apartment and added a 10 (gf's).
so...
+50
+30
+20
-30
-20
+75
+10
so...
+50
+30
+20
-30
-20
+75
+10