I use a 50W heater in my 10g quarantine tank but there is no reason you couldn't use a 100W heater as long as it is reliable like the Visi-Therm Stealth. The only reason not to use one would be if you were afraid that the heater would fail and lock in the 'on' position so that your fish 'boiled'.
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Gene Heitman - 12 tanks (11 freshwater and 1 saltwater), 206 gallons, 20+ species of fish/shrimp/snails, 52+ species of plants ... 10 years ago I just wanted 1 tank with some fish
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