I'm trying to get my 29g tank temp down from the low/mid 80's with the light off into the mid 70's. I'm thinking of using a TEC chip to cool the water in a HOB
filter, but am trying to determine the best way. I can get all the electrical buss bar I want, and that would give me plenty of mass and surface on the "evaporator" (cold) side. Should I cut a hole in the back of my HOB
and seal with the buss bar? How well will the TEC pull heat through the plastic wall of the filter? (Probably won't work) ...or should I do something different? Topless with big airflow so far won't get this tank below 80 overnight with the light off.