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2" to 4" into the hole I would think. You will need to experiment with it. Try a long piece and start sliding it down. Air line tube should work but may need larger.
The Principle is to introduce all the air needed for smooth flow into the tube below where the water flows over into the down pipe.
Looks great. One suggestion.
The brass fitting will lose heat to the air quite fast and give a lower reading with low flow rate. It would be more accurate if you put some insulating material around it (some thin foam or cloth would do).
OK. This is a freshwater gold fish tank. Lots of crap to convert to nitrate. I can deal with the nitrate with weekly 50% water changes. Water flow will not be a problem.
I am thinking that Little difference in bacteria efficiency will occur because the water below the filter should be high in...
I am building a sub with a trickle filter. I have a hight limitation for the hole unit and would like to get as much water in system as possible.
My options are:
1) Use less bio media. Shorter trickle filter to stay above water.
2) Allow bottom few inches of bio media to be submerged.
3) Use...