04-11-2008, 07:24 AM
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I haven't tried much else, and I can only wish I had a 125 gal. I was using an old Top Fin 100W (i think) for my 30 gal. They recommend at least 150 for a 30 gal, but the 100 keeps my tank right at 78 on a med power setting. I recently got a 150W for the 30 gal so I could use the older, smaller one in the 20 gal I'm putting together. I have to keep the new 150 on low to keep from cooking my fish. Not that any of this applies to your tank, but I'd say Top Fin heaters are pretty good and well priced. They have a lifetime guarantee too. So from my calculations and little bit of experience, I'd think you'd be OK with 300W worth, probably better as 2 150W units spaced across the tank.