I wouldn't run anything on a drain line that will create head loss. The chiller will slow the drain and could (over time) slow it enough to create a flood. Run it on a pump.
1/10 HP should be fine for a 40 gallon. I would either run it off your return pump if you have enough power there, or use a dedicated return pump. I use a Mag 3 for my Current USA Prime 1/10 HP chiller on my 60 gallon.
Dave
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