Ok...I have my Aqueon tank ready for water (I think). So I filled 1/2 the tank with water (leak test). I put a gallon or two in the overflow area (to leak test the bulkheads). No leaks....but I have water trickling into the sump so did I not understand , should I have glued the durso drains into the bulheads? The Aqueon plumbing snapped together...so I guess not waterproof. Is this normal? So all the water in the overflow towers can drain into the sump?