overflow problem new tank
I recently purchased a used 125 gallon tank with 2 overflows. When I filled the tank one of the overflows started filling with water before the other. . The tank was drilled and glass installed to make the overflows before I purchased. the overflows are Durso type overflows.
The side that has the glass higher has varying water level. It will be even witrh the other then fall 2 inches and then fill back up those 2 inches and repeat this all the time.
How can i fizx this short of putting new glass in?