WOW yeah sounds exactly the same. I have a bleed back to my sump but with the return pump on this 35 gallon frag tank doesn't seem strong enough to be able to use it. I had a various 2 (some say rated for 70gallon ?) I think it is like 550-675 GPH at 4 headset (rated 795 mph max or something like that) and on the highest setting, and with tubing (no pic right angles) you would think it would be enough.Yeah I had all the same anxieties as you...I also did this on the return so as to not give head pressure but I could still run it fast enough to turn the DT over 2-3 times an hour (see pic). I am bleeding speed off the return back into the sump....probably doesn’t matter what chamber, and I’m sure there are much better methods but it worked for my problems and they sound similar lol!
how strong is your pump? I am feeling less stressed about it hearing from you.