Let me start by saying there isn't any mail today, holiday. Ok, heres were we are at, the tank is full and the sump is running. Seeings how I have never seen a sump running I will try and tell you what its doing and ya'll can tell me if it sounds about right. The first chamber in the sump, the drain from the tank, has a glass divider in it, about 2 inchs off the bottom of the sump tank and rises to about 3 inches from the top of the sump tank ( I think this is about a 45 gallon sump tank, just a guess) anyway this chamber is half full and maintains this level. The second chamber, which is fed thru the space from under the first chambers divider has a sponge in it, this second chamber has a divider, and its about half the height of the tank and half the height of the first chambers height. The water works it way thru the sponge and over the divider and into the last chamber where the skimmer sits (not running) and the return pump sits. I have this chamber half full, which means the return pump is just covered with water. At first it was a balancing act trying to get enough water in this chamber so the pump would pump without sucking water and air, anyway, its not sucking air and is maintaining its water level, a balance has been found, between the drain from the tank and the return pump. Does this sound about right or wrong? Also, my LR won't be here as I told you till Thursday, should I turn the pumps off now and put my sand in the tank or wait till I have the LR in the tank?