I just set up a new marineland 120G marine tank with two acrylic overflow boxes in the tank 1 inch for all 4 drilled from the bottom holes and starphire glass on 4 sides. The durso drains are ok, but the two return pipes have an interesting design. They have a 1/16 or 1/8, cant really tell because tank is running, anti-siphon hole drilled into the return standpipe inside of the acrylic overflow box just above the waterline inside the overflow shooting straight towards the front of the overflow box so when the pump is on, most water comes out of the adjustable heads that extend to the tank itself, but some comes out of this anti-siphon hole and sprays hard against the inside wall of the overflow and shoots up onto the top of my glass when it deflects on the overflow wall at such a rapid pace. Is there something that I can do to correct this problem. I thought of putting some aquarium sealant and filling the two anti-siphon holes and drilling one underneath the returns adjustable head that actually is located in the tank, but I wanted to get some advice first. What do you thinK?