My tank will do that sometimes when the bulkhead overflow **** gets a little plugged up (macro grows in the teeth) and the water level rises. The water leaks at the top tank trim and wicks down the corner seam where it isn't seen and pools in the bottom trim. If you do have a bag of aragonite and it suits you, why not use it? Maybe wait till things are going back into the main tank so there's less sand to move and wash? This almost sounds like an size upgrade opportunity?
