actually I am running a sump with mine right works the same as any other tank. As for the big mess im not to sure how that would ever happen. Other than the upper or lower tank breaking. Be the same mess if a regular tank broke. But lets just say there was no sump and as the water evaporates the level would drop in the lower tank reaching the brim of the upper aquarium. Thats where you think you lose your hydrostatic pressure and the upper tank would dump its water volume making a mess?? It doesnt though. What happens (cause i tested this out) the upper tank does a big burp or gulp if you will for air until the water rises in the lower tank, goes above the brim and then stops. Its all really quite simple and fool proof.
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