I bought my tank used a few years ago and have always had to deal with the siphoning issue when my return pump is off. The ball tubing on the return outlets don't have any kind of anti-siphon holes so I end up draining like 3" from the DT into the sump. Thankfully my sump is sized such that it can handle this, barely.
I would like to actually fix this issue so as not to have this ongoing worry in the future. Maybe this is a dumb question, but how exactly do I go about doing this? I assume that I'm going to need to do this during a water change when I have the water level down below the returns, but how exactly do I drill this? Do I worry about the type of bit due to copper or other metals coming into contact with the water? I assume that I drill it on the highest portion of the return line? I also assume that the smallest diameter drill bit I have will be sufficient? What other questions should I ask that I'm missing?
Finally, this is probably another dumb question, but... If I have a hole in the return line, won't water come shooting out of that hole when the return pump is on?
I would like to actually fix this issue so as not to have this ongoing worry in the future. Maybe this is a dumb question, but how exactly do I go about doing this? I assume that I'm going to need to do this during a water change when I have the water level down below the returns, but how exactly do I drill this? Do I worry about the type of bit due to copper or other metals coming into contact with the water? I assume that I drill it on the highest portion of the return line? I also assume that the smallest diameter drill bit I have will be sufficient? What other questions should I ask that I'm missing?
Finally, this is probably another dumb question, but... If I have a hole in the return line, won't water come shooting out of that hole when the return pump is on?