Ok, an interesting problem I've been noticing the past week.
The Solana has a built in overflow, second chamber (where my skimmer is presently but usually reserved for carbon bags and such) and a third chamber for the return pump (which is also where my ATO float switches are)
As days progress on, the foam filtration just inside of the overflow seems to clog up (not sure with what, there's nothing in the tank but LR). In turn the "display" area of the tank rises as the overflow volume slows.. which lowers the water enough in my overflow/return pump area to kick on my ATO. This seems to be SLOWLY lowering the SG in the tank, since it's not simply evaporation it's topping off, but "low volume" due to a "clogged" filter (that's really not clogged, but just water logged).. upon removal of the filter the DT portion of the tank gets lower again and the water level where the ATO/return pump are now "overfilled". The cycle continues once I put the filter foam back in.
This causes problems (in both cases) with my skimmer since my water level does not stay constant....
Is it typical to see the ATO slowly drop your SG in your tank or am I doing something wrong in this balancing act? If I removed the foam filter all together this would never happen but the overflow is LOUD this way.... and I think going 2-3 days or even longer isn't out of the acceptable range for cleaning filter media, is it?