If you do use it, I wouldn't bother having it on all the time. Like I posted earlier, I usually only have it plugged in for a week or two after I introduce a new fish, when the stress level's highest & risk of ick or other outbreaks are greatest. (Although a 9 watt unit seems kinda small (ie. underpowered) for a 120g system). Mine's 40w & I'm very happy with what it does for my 100g system. It's on it's own loop & unconnected to any sump. If you're worried about zapping your pods then probably avoid attaching it on the return from the refugium.
Just my $.02.
Anthony
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If you see it, can take care of it, better get it or put it on hold. Otherwise, it'll be gone & you'll regret it!
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