Don't forget, for a drip rate you can always use irrigation drippers sold at Home Depot or Rona to name just two sources. You can get 1/2 gallon per hour, 1 Gph or 2 Gph drippers. I used them on a homemade Ca reactor and just made sure I changed them often. They're cheap so no big deal.
Doug
PS I would think a Fluvel would be great as a housing for the coiled lines, input from the tank/sump and output into the sump at a controlled rate. Coils are supposed to be kept in the dark if I remember right so the fluvel would work well.
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