Yep, that was one of the first things Ilearned, months before I even put my sump together. I've been selling some tanks and gear to newbie saltwater people and have mentioned it to every one of them, and not one even considered that factor. I have mine right at the water line so I do get a nice little stream of water but it's all good by me. My B/F drilled the hole straight on instead of on an angle but I have another return nozzle to do it right one day. lol
This forum rocks! Just have to say it. I would never in a million years or until I flooded thought of that back siphoning from the return.
180g Reef - 60g Rimless Reef -90G FOWLR- 125g Malawi Cichlids- 40b REEF- 34g Fresh Planted-working on- 20L FOWLR- working on
I have a mix of many different saltwater fish amongst my tanks, but I love my Tangs most of all.