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You're an advanced hobbyist, so you probably know more about nano heaters than most of the folks around here...
Looking at the standard F&S and MarineDepot, I'm seeing the Hydor Theo (currently on sale on F&S) that fit your size range for 50w, and that's about it. None of the other brands make shorter heaters, they're all the long glass or titanium tubes, but they're also 10" or longer.
I know you don't want to hear it, but I've been using cobalt neo therm heaters for the 2.5 years my tank has been up without any hiccups. The main heater is in my nano tank on a ReefKeeper controller, and the other is used for water change water. So far, so good with both. Sorry you had a bad experience (or have seen bad experiences). Excluding them, I don't think there are any other options I'd even consider having in my tank that meet your size requirements (I'm sure there's some really ghetto chinese knockoff of a knockoff of a knockoff on ebay, but I wouldn't bother with that).
Good luck, that's a really cool RBTA breeding setup you're building!
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